[arch-commits] Commit in sagemath-doc/repos (8 files)
Antonio Rojas
arojas at archlinux.org
Thu Oct 20 12:15:16 UTC 2016
Date: Thursday, October 20, 2016 @ 12:15:15
Author: arojas
Revision: 192728
archrelease: copy trunk to community-testing-any
Added:
sagemath-doc/repos/community-testing-any/
sagemath-doc/repos/community-testing-any/PKGBUILD
(from rev 192727, sagemath-doc/trunk/PKGBUILD)
sagemath-doc/repos/community-testing-any/disable-fes.patch
(from rev 192727, sagemath-doc/trunk/disable-fes.patch)
sagemath-doc/repos/community-testing-any/docbuild_main.patch
(from rev 192727, sagemath-doc/trunk/docbuild_main.patch)
sagemath-doc/repos/community-testing-any/ecm-7.patch
(from rev 192727, sagemath-doc/trunk/ecm-7.patch)
sagemath-doc/repos/community-testing-any/is-package-installed.patch
(from rev 192727, sagemath-doc/trunk/is-package-installed.patch)
sagemath-doc/repos/community-testing-any/package.patch
(from rev 192727, sagemath-doc/trunk/package.patch)
sagemath-doc/repos/community-testing-any/sagemath-singular4.patch
(from rev 192727, sagemath-doc/trunk/sagemath-singular4.patch)
----------------------------+
PKGBUILD | 100 +
disable-fes.patch | 19
docbuild_main.patch | 8
ecm-7.patch | 79
is-package-installed.patch | 329 +++
package.patch | 40
sagemath-singular4.patch | 3731 +++++++++++++++++++++++++++++++++++++++++++
7 files changed, 4306 insertions(+)
Copied: sagemath-doc/repos/community-testing-any/PKGBUILD (from rev 192727, sagemath-doc/trunk/PKGBUILD)
===================================================================
--- community-testing-any/PKGBUILD (rev 0)
+++ community-testing-any/PKGBUILD 2016-10-20 12:15:15 UTC (rev 192728)
@@ -0,0 +1,100 @@
+# $Id$
+# Maintainer: Antonio Rojas <arojas at archlinux.org>
+
+pkgbase=sagemath-doc
+pkgname=(sagemath-doc sagemath-src)
+pkgver=7.4
+pkgrel=1
+arch=(any)
+url="http://www.sagemath.org"
+license=(GPL)
+makedepends=(sagemath sage-notebook python2-pyzmq python2-pillow python2-docutils ipython2-notebook python2-pkgconfig cython2 python2-sphinx)
+source=("$pkgbase-$pkgver.tar.gz::https://github.com/sagemath/sage/archive/$pkgver.tar.gz"
+ package.patch disable-fes.patch docbuild_main.patch is-package-installed.patch
+ ecm-7.patch sagemath-singular4.patch)
+md5sums=('8311ee35a309dbc668b5148795211254'
+ '493a9e0eae9b2ef87544b42785ae11ea'
+ '06a67e611d10aa2381efe1f08ea4ffd9'
+ 'f3bf3fa4e11e5af2bd0573cf2620e1f8'
+ '5dca842e4440e4ef235ae18c1b1f20e3'
+ '0c9a57d35de80c2cd418ebec912efbbb'
+ '4bd7305e8b69add8356f9751470cf587')
+
+prepare() {
+ cd sage-$pkgver
+
+# Arch-specific patches
+# assume all optional packages are installed
+ patch -p0 -i ../package.patch
+# supress warning about GAP install dir
+ sed -e "s|gapdir = os.path.join(SAGE_LOCAL, 'gap', 'latest')|gapdir = '/usr/lib/gap'|" -i src/sage/libs/gap/util.pyx
+# fix regressions with ECM 7
+ patch -p1 -i ../ecm-7.patch
+
+# Upstream patches
+# fix build against libfes 0.2 http://trac.sagemath.org/ticket/15209
+# patch -p0 -i ../fes02.patch
+# disable fes module, fails to build
+ patch -p0 -i ../disable-fes.patch
+# replace is_package_installed usage http://trac.sagemath.org/ticket/20377
+ patch -p1 -i ../is-package-installed.patch
+# port to Singular 4 https://trac.sagemath.org/ticket/17254
+ patch -p1 -i ../sagemath-singular4.patch
+
+# fix relative imports
+ patch -p0 -i ../docbuild_main.patch
+
+# use python2
+ sed -e 's|cython %s %s|cython2 %s %s|' -e 's|python setup.py|python2 setup.py|' -i src/sage/misc/cython.py
+
+ mkdir local-python
+ ln -sr src/sage_setup local-python
+}
+
+build() {
+ cd sage-$pkgver/src
+
+ export SAGE_LOCAL="/usr"
+ export SAGE_SRC="$PWD"
+ export SAGE_DOC_SRC="$SAGE_SRC"/doc
+ export SAGE_DOC="$SAGE_SRC"/doc
+ export SAGE_DOC_MATHJAX=yes
+ export PYTHONPATH="/usr/lib/sage/site-packages:$srcdir/sage-$pkgver/local-python"
+ python2 sage_setup/docbuild --no-pdf-links -k all html
+}
+
+package_sagemath-doc() {
+ pkgdesc="HTML documentation and inline help for SageMath"
+ depends=(sage-notebook python2-sphinx gap-doc)
+ conflicts=(sage-mathematics-doc)
+ replaces=(sage-mathematics-doc)
+
+ cd sage-$pkgver/src/doc
+
+ mkdir -p "$pkgdir"/usr/share/doc/sage/en
+ cp -r en/introspect "$pkgdir"/usr/share/doc/sage/en
+ cp -r common "$pkgdir"/usr/share/doc/sage
+ cp -r html "$pkgdir"/usr/share/doc/sage
+
+# Replace duplicated files by symlinks (Gentoo)
+ cd "$pkgdir"/usr/share/doc/sage
+ mv html/en/_static{,.tmp}
+ for _dir in `find -name _static` ; do
+ rm -r $_dir
+ ln -s /usr/share/doc/sage/html/en/_static $_dir
+ done
+ mv html/en/_static{.tmp,}
+
+# Remove unneeded files
+ find html -name '*.py' -exec rm -r {} \;
+}
+
+package_sagemath-src() {
+ pkgdesc="Source files for SageMath"
+ conflicts=(sage-mathematics-src)
+ replaces=(sage-mathematics-src)
+
+ mkdir -p "$pkgdir"/usr/share/sage/source
+ cp -r sage-$pkgver/src/{sage,sage_setup} "$pkgdir"/usr/share/sage/source
+ ln -s /usr/share/doc/sage/html "$pkgdir"/usr/share/sage/source/doc
+}
Copied: sagemath-doc/repos/community-testing-any/disable-fes.patch (from rev 192727, sagemath-doc/trunk/disable-fes.patch)
===================================================================
--- community-testing-any/disable-fes.patch (rev 0)
+++ community-testing-any/disable-fes.patch 2016-10-20 12:15:15 UTC (rev 192728)
@@ -0,0 +1,19 @@
+--- src/module_list.py.orig 2015-06-07 11:29:30.710612146 +0200
++++ src/module_list.py 2015-06-07 11:30:21.877506106 +0200
+@@ -564,11 +564,11 @@
+ sources = ["sage/libs/ecl.pyx"],
+ libraries = ["ecl"]),
+
+- OptionalExtension("sage.libs.fes",
+- ["sage/libs/fes.pyx"],
+- language = "c",
+- libraries = ['fes'],
+- package = 'fes'),
++# OptionalExtension("sage.libs.fes",
++# ["sage/libs/fes.pyx"],
++# language = "c",
++# libraries = ['fes'],
++# package = 'fes'),
+
+ Extension('sage.libs.flint.flint',
+ sources = ["sage/libs/flint/flint.pyx"],
Copied: sagemath-doc/repos/community-testing-any/docbuild_main.patch (from rev 192727, sagemath-doc/trunk/docbuild_main.patch)
===================================================================
--- community-testing-any/docbuild_main.patch (rev 0)
+++ community-testing-any/docbuild_main.patch 2016-10-20 12:15:15 UTC (rev 192728)
@@ -0,0 +1,8 @@
+--- src/sage_setup/docbuild/__main__.py.orig
++++ src/sage_setup/docbuild/__main__.py
+@@ -1,3 +1,3 @@
+-from . import main
++from sage_setup.docbuild import main
+ main()
+
+ # Remove old documentation
Copied: sagemath-doc/repos/community-testing-any/ecm-7.patch (from rev 192727, sagemath-doc/trunk/ecm-7.patch)
===================================================================
--- community-testing-any/ecm-7.patch (rev 0)
+++ community-testing-any/ecm-7.patch 2016-10-20 12:15:15 UTC (rev 192728)
@@ -0,0 +1,79 @@
+--- a/src/sage/interfaces/ecm.py.orig 2016-05-16 22:18:03.894827738 +0200
++++ b/src/sage/interfaces/ecm.py 2016-05-16 22:19:14.674904932 +0200
+@@ -140,9 +140,6 @@
+ - ``ve`` -- integer `n`. Verbosely show short (`< n`
+ character) expressions on each loop
+
+- - ``cofdec`` -- boolean. Force cofactor output in decimal
+- (even if expressions are used )
+-
+ - ``B2scale`` -- integer. Multiplies the default B2 value
+
+ - ``go`` -- integer. Preload with group order val, which can
+@@ -395,15 +392,15 @@
+ if m is not None:
+ factor = m.group('factor')
+ primality = m.group('primality')
+- assert primality in ['probable prime', 'composite']
+- result += [(ZZ(factor), primality == 'probable prime')]
++ assert primality in ['prime', 'composite']
++ result += [(ZZ(factor), primality == 'prime')]
+ continue # cofactor on the next line
+ m = self._found_cofactor_re.match(line)
+ if m is not None:
+ cofactor = m.group('cofactor')
+ primality = m.group('primality')
+- assert primality in ['Probable prime', 'Composite']
+- result += [(ZZ(cofactor), primality == 'Probable prime')]
++ assert primality in ['Prime', 'Composite']
++ result += [(ZZ(cofactor), primality == 'Prime')]
+ # assert len(result) == 2
+ return result
+ raise ValueError('failed to parse ECM output')
+@@ -501,7 +498,6 @@
+ if factor_digits is not None:
+ B1 = self.recommended_B1(factor_digits)
+ kwds['one'] = True
+- kwds['cofdec'] = True
+ cmd = self._make_cmd(B1, None, kwds)
+ out = self._run_ecm(cmd, n)
+ return self._parse_output(n, out)
+@@ -828,8 +828,8 @@
+ Step 1 took 12ms
+ Step 2 took 17ms
+ ********** Factor found in step 2: 79792266297612017
+-Found probable prime factor of 17 digits: 79792266297612017
+-Probable prime cofactor 6366805760909027985741435139224233 has 34 digits
++Found prime factor of 17 digits: 79792266297612017
++Prime cofactor 6366805760909027985741435139224233 has 34 digits
+ """
+
+ TEST_ECM_OUTPUT_2 = """
+@@ -839,8 +839,8 @@
+ Step 1 took 2ms
+ Step 2 took 3ms
+ ********** Factor found in step 2: 179424673
+-Found probable prime factor of 9 digits: 179424673
+-Probable prime cofactor 179424673 has 9 digits
++Found prime factor of 9 digits: 179424673
++Prime cofactor 179424673 has 9 digits
+ """
+
+ TEST_ECM_OUTPUT_3 = """
+@@ -858,7 +858,7 @@
+ Step 1 took 5ms
+ Step 2 took 4ms
+ ********** Factor found in step 2: 197002597249
+-Found probable prime factor of 12 digits: 197002597249
++Found prime factor of 12 digits: 197002597249
+ Composite cofactor 339872432034468861533158743041639097889948066859 has 48 digits
+ """
+
+@@ -870,5 +870,5 @@
+ Step 2 took 2ms
+ ********** Factor found in step 2: 265748496095531068869578877937
+ Found composite factor of 30 digits: 265748496095531068869578877937
+-Probable prime cofactor 251951573867253012259144010843 has 30 digits
++Prime cofactor 251951573867253012259144010843 has 30 digits
+ """
+
Copied: sagemath-doc/repos/community-testing-any/is-package-installed.patch (from rev 192727, sagemath-doc/trunk/is-package-installed.patch)
===================================================================
--- community-testing-any/is-package-installed.patch (rev 0)
+++ community-testing-any/is-package-installed.patch 2016-10-20 12:15:15 UTC (rev 192728)
@@ -0,0 +1,329 @@
+diff --git a/src/sage/databases/cremona.py b/src/sage/databases/cremona.py
+index 0a5f794..2969d92 100644
+--- a/src/sage/databases/cremona.py
++++ b/src/sage/databases/cremona.py
+@@ -53,7 +53,6 @@ from sage.misc.prandom import randint
+
+ import sage.schemes.elliptic_curves.constructor as elliptic
+ from .sql_db import SQLDatabase, verify_column
+-from sage.misc.package import is_package_installed
+ from sage.env import SAGE_SHARE
+ from sage.misc.all import walltime
+
+@@ -824,7 +823,7 @@ class MiniCremonaDatabase(SQLDatabase):
+ if N < self.largest_conductor():
+ message = "There is no elliptic curve with label " + label \
+ + " in the database"
+- elif is_package_installed('database_cremona_ellcurve'):
++ elif os.path.isfile(os.path.join(SAGE_SHARE, "cremona", "cremona.db")):
+ message = "There is no elliptic curve with label " + label \
+ + " in the currently available databases"
+ else:
+@@ -1673,7 +1672,7 @@ def CremonaDatabase(name=None,mini=None,set_global=None):
+ if name is None and not set_global:
+ return _db
+ if set_global and name is None:
+- if is_package_installed('database_cremona_ellcurve'):
++ if os.path.isfile(os.path.join(SAGE_SHARE, "cremona", "cremona.db")):
+ name = 'cremona'
+ else:
+ name = 'cremona mini'
+diff --git a/src/sage/game_theory/normal_form_game.py b/src/sage/game_theory/normal_form_game.py
+index b917d2a..80fb20c 100644
+--- a/src/sage/game_theory/normal_form_game.py
++++ b/src/sage/game_theory/normal_form_game.py
+@@ -614,8 +614,9 @@ from sage.rings.all import QQ
+ from sage.structure.sage_object import SageObject
+ from sage.matrix.constructor import matrix
+ from sage.matrix.constructor import vector
+-from sage.misc.package import is_package_installed
+ from sage.misc.temporary_file import tmp_filename
++import os
++from sage.env import SAGE_LOCAL
+
+ try:
+ from gambit import Game
+@@ -1317,13 +1318,13 @@ class NormalFormGame(SageObject, MutableMapping):
+ raise ValueError("utilities have not been populated")
+
+ if not algorithm:
+- if is_package_installed('lrslib'):
++ if os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'lrs')):
+ algorithm = "lrs"
+ else:
+ algorithm = "enumeration"
+
+ if algorithm == "lrs":
+- if not is_package_installed('lrslib'):
++ if not os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'lrs')):
+ raise NotImplementedError("lrslib is not installed")
+
+ return self._solve_lrs(maximization)
+diff --git a/src/sage/geometry/polyhedron/base.py b/src/sage/geometry/polyhedron/base.py
+index 2f58d8b..eb519a2 100644
+--- a/src/sage/geometry/polyhedron/base.py
++++ b/src/sage/geometry/polyhedron/base.py
+@@ -21,7 +21,6 @@ import six
+ from sage.structure.element import Element, coerce_binop, is_Vector
+
+ from sage.misc.all import cached_method, prod
+-from sage.misc.package import is_package_installed
+
+ from sage.rings.all import QQ, ZZ
+ from sage.rings.real_double import RDF
+@@ -3691,7 +3690,9 @@ class Polyhedron_base(Element):
+
+ David Avis's lrs program.
+ """
+- if not is_package_installed('lrslib'):
++ import os
++ from sage.env import SAGE_LOCAL
++ if os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'lrs')) != True:
+ raise NotImplementedError('You must install the optional lrslib package '
+ 'for this function to work')
+
+diff --git a/src/sage/graphs/generators/classical_geometries.py b/src/sage/graphs/generators/classical_geometries.py
+index e80f2a5..04cd9ce 100644
+--- a/src/sage/graphs/generators/classical_geometries.py
++++ b/src/sage/graphs/generators/classical_geometries.py
+@@ -1287,10 +1287,9 @@ def CossidentePenttilaGraph(q):
+ raise ValueError('q(={}) must be an odd prime power'.format(q))
+
+ from sage.libs.gap.libgap import libgap
+- from sage.misc.package import is_package_installed, PackageNotFoundError
++ from sage.interfaces.gap import gap
+
+- if not is_package_installed('gap_packages'):
+- raise PackageNotFoundError('gap_packages')
++ gap.load_package("grape")
+
+ adj_list=libgap.function_factory("""function(q)
+ local z, e, so, G, nu, G1, G0, B, T, s, O1, O2, x;
+diff --git a/src/sage/graphs/generic_graph.py b/src/sage/graphs/generic_graph.py
+index 252984f..ce19682 100644
+--- a/src/sage/graphs/generic_graph.py
++++ b/src/sage/graphs/generic_graph.py
+@@ -7858,7 +7858,6 @@ class GenericGraph(GenericGraph_pyx):
+ sage: abs(flow_ff-flow_igraph) < 0.00001 # optional python_igraph
+ True
+ """
+- from sage.misc.package import is_package_installed
+ self._scream_if_not_simple(allow_loops=True)
+ if vertex_bound and algorithm in ["FF", "igraph"]:
+ raise ValueError("This method does not support both " +
+@@ -7876,10 +7875,12 @@ class GenericGraph(GenericGraph_pyx):
+ if algorithm is None:
+ if vertex_bound:
+ algorithm = "LP"
+- elif is_package_installed("python_igraph"):
+- algorithm = "igraph"
+ else:
+- algorithm = "FF"
++ algorithm = "igraph"
++ try:
++ import igraph
++ except ImportError:
++ algorithm = "FF"
+
+ if (algorithm == "FF"):
+ return self._ford_fulkerson(x,y, value_only=value_only, integer=integer, use_edge_labels=use_edge_labels)
+diff --git a/src/sage/graphs/graph_generators.py b/src/sage/graphs/graph_generators.py
+index 5919ab3..1766796 100644
+--- a/src/sage/graphs/graph_generators.py
++++ b/src/sage/graphs/graph_generators.py
+@@ -1195,8 +1195,9 @@ class GraphGenerators():
+ .. [buckygen] \G. Brinkmann, J. Goedgebeur and B.D. McKay, Generation of Fullerenes,
+ Journal of Chemical Information and Modeling, 52(11):2910-2918, 2012.
+ """
+- from sage.misc.package import is_package_installed
+- if not is_package_installed("buckygen"):
++ import os
++ from sage.env import SAGE_LOCAL
++ if not os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'buckygen')):
+ raise TypeError("the optional buckygen package is not installed")
+
+ # number of vertices should be positive
+@@ -1280,8 +1281,9 @@ class GraphGenerators():
+ .. [benzene] \G. Brinkmann, G. Caporossi and P. Hansen, A Constructive Enumeration of Fusenes and Benzenoids,
+ Journal of Algorithms, 45:155-166, 2002.
+ """
+- from sage.misc.package import is_package_installed
+- if not is_package_installed("benzene"):
++ import os
++ from sage.env import SAGE_LOCAL
++ if not os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'benzene')):
+ raise TypeError("the optional benzene package is not installed")
+
+ # number of hexagons should be positive
+@@ -1433,8 +1435,9 @@ class GraphGenerators():
+ .. [plantri] \G. Brinkmann and B.D. McKay, Fast generation of planar graphs,
+ MATCH-Communications in Mathematical and in Computer Chemistry, 58(2):323-357, 2007.
+ """
+- from sage.misc.package import is_package_installed
+- if not is_package_installed("plantri"):
++ import os
++ from sage.env import SAGE_LOCAL
++ if not os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'plantri')):
+ raise TypeError("the optional plantri package is not installed")
+
+ # number of vertices should be positive
+@@ -1632,8 +1635,9 @@ class GraphGenerators():
+ sage: [g.size() for g in graphs.triangulations(6, minimum_connectivity=3)] # optional plantri
+ [12, 12]
+ """
+- from sage.misc.package import is_package_installed
+- if not is_package_installed("plantri"):
++ import os
++ from sage.env import SAGE_LOCAL
++ if not os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'plantri')):
+ raise TypeError("the optional plantri package is not installed")
+
+ # number of vertices should be positive
+@@ -1786,8 +1790,9 @@ class GraphGenerators():
+ sage: [len(g) for g in graphs.quadrangulations(12, no_nonfacial_quadrangles=True, dual=True)] # optional plantri
+ [10, 10]
+ """
+- from sage.misc.package import is_package_installed
+- if not is_package_installed("plantri"):
++ import os
++ from sage.env import SAGE_LOCAL
++ if not os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'plantri')):
+ raise TypeError("the optional plantri package is not installed")
+
+ # number of vertices should be positive
+diff --git a/src/sage/graphs/lovasz_theta.py b/src/sage/graphs/lovasz_theta.py
+index 0d345c9..60948d2 100644
+--- a/src/sage/graphs/lovasz_theta.py
++++ b/src/sage/graphs/lovasz_theta.py
+@@ -65,10 +65,9 @@ def lovasz_theta(graph):
+ from sage.misc.temporary_file import tmp_filename
+ import os, subprocess
+ from sage.env import SAGE_LOCAL
+- from sage.misc.package import is_package_installed, PackageNotFoundError
+
+- if not is_package_installed('csdp'):
+- raise PackageNotFoundError("csdp")
++ if not os.path.isfile(os.path.join(SAGE_LOCAL, 'bin', 'theta')):
++ raise NotImplementedError("You must install csdp before using this function")
+
+ g = graph.relabel(inplace=False, perm=range(1,n+1)).networkx_graph()
+ tf_name = tmp_filename()
+diff --git a/src/sage/groups/generic.py b/src/sage/groups/generic.py
+index c801636..f43e6d9 100644
+--- a/src/sage/groups/generic.py
++++ b/src/sage/groups/generic.py
+@@ -1400,15 +1400,15 @@ def structure_description(G, latex=False):
+ sage: groups.matrix.GL(4,2).structure_description() # optional - database_gap
+ 'A8'
+ """
+- import re
+- from sage.misc.package import is_package_installed
++ import re, os
++ from sage.env import SAGE_LOCAL
+ def correct_dihedral_degree(match):
+ return "%sD%d" % (match.group(1), int(match.group(2))/2)
+
+ try:
+ description = str(G._gap_().StructureDescription())
+ except RuntimeError:
+- if not is_package_installed('database_gap'):
++ if not os.path.isfile(os.path.join(SAGE_LOCAL, "lib", "gap", "small", "readsml.g")):
+ raise RuntimeError("You must install the optional database_gap package first.")
+ raise
+
+diff --git a/src/sage/groups/perm_gps/permgroup.py b/src/sage/groups/perm_gps/permgroup.py
+index e42db61..d4d5684 100644
+--- a/src/sage/groups/perm_gps/permgroup.py
++++ b/src/sage/groups/perm_gps/permgroup.py
+@@ -145,7 +145,6 @@ from sage.groups.perm_gps.permgroup_element import PermutationGroupElement, stan
+ from sage.groups.abelian_gps.abelian_group import AbelianGroup
+ from sage.misc.cachefunc import cached_method
+ from sage.groups.class_function import ClassFunction
+-from sage.misc.package import is_package_installed
+ from sage.sets.finite_enumerated_set import FiniteEnumeratedSet
+ from sage.categories.all import FiniteEnumeratedSets
+ from sage.groups.conjugacy_classes import ConjugacyClassGAP
+@@ -190,8 +189,6 @@ def hap_decorator(f):
+ """
+ @wraps(f)
+ def wrapped(self, n, p=0):
+- if not is_package_installed('gap_packages'):
+- raise RuntimeError("You must install the optional gap_packages package.")
+ load_hap()
+ from sage.arith.all import is_prime
+ if not (p == 0 or is_prime(p)):
+@@ -1682,9 +1679,7 @@ class PermutationGroup_generic(group.FiniteGroup):
+ try:
+ return [Integer(n) for n in self._gap_().IdGroup()]
+ except RuntimeError:
+- if not is_package_installed('database_gap'):
+- raise RuntimeError("You must install the optional database_gap package first.")
+- raise
++ raise RuntimeError("You must install the optional gap_packages package.")
+
+ def id(self):
+ """
+@@ -1735,9 +1730,7 @@ class PermutationGroup_generic(group.FiniteGroup):
+ try:
+ return Integer(self._gap_().PrimitiveIdentification())
+ except RuntimeError:
+- if not is_package_installed('database_gap'):
+- raise RuntimeError("You must install the optional database_gap package first.")
+- raise
++ raise RuntimeError("You must install the optional gap_packages package.")
+
+ def center(self):
+ """
+@@ -4113,8 +4106,6 @@ class PermutationGroup_generic(group.FiniteGroup):
+ - David Joyner and Graham Ellis
+
+ """
+- if not is_package_installed('gap_packages'):
+- raise RuntimeError("You must install the optional gap_packages package.")
+ load_hap()
+ from sage.arith.all import is_prime
+ if not (p == 0 or is_prime(p)):
+diff --git a/src/sage/misc/all.py b/src/sage/misc/all.py
+index 90e6985..21daeb0 100644
+--- a/src/sage/misc/all.py
++++ b/src/sage/misc/all.py
+@@ -53,11 +53,6 @@ from fpickle import pickle_function, unpickle_function
+
+ from .dist import install_scripts
+
+-from .package import (install_package,
+- installed_packages, is_package_installed,
+- standard_packages, optional_packages, experimental_packages,
+- upgrade, package_versions)
+-
+ from .pager import pager
+
+ lazy_import('sage.misc.sagedoc', ['browse_sage_doc',
+diff --git a/src/sage/rings/polynomial/multi_polynomial_sequence.py b/src/sage/rings/polynomial/multi_polynomial_sequence.py
+index da41cb0..49cae0b 100644
+--- a/src/sage/rings/polynomial/multi_polynomial_sequence.py
++++ b/src/sage/rings/polynomial/multi_polynomial_sequence.py
+@@ -163,7 +163,6 @@ from sage.misc.cachefunc import cached_method
+
+ from types import GeneratorType
+ from sage.misc.converting_dict import KeyConvertingDict
+-from sage.misc.package import is_package_installed
+
+ from sage.structure.sequence import Sequence, Sequence_generic
+
+@@ -1433,10 +1432,11 @@ class PolynomialSequence_gf2(PolynomialSequence_generic):
+
+ if S != []:
+ if algorithm == "exhaustive_search":
+- if not is_package_installed('fes'):
+- from sage.misc.package import PackageNotFoundError
+- raise PackageNotFoundError("fes")
+- from sage.libs.fes import exhaustive_search
++ try:
++ from sage.libs.fes import exhaustive_search
++ except ImportError:
++ raise RuntimeError("You must install the optional fes package.")
++
+ solutions = exhaustive_search(S, max_sols=n, verbose=verbose, **kwds)
+
+ elif algorithm == "polybori":
Copied: sagemath-doc/repos/community-testing-any/package.patch (from rev 192727, sagemath-doc/trunk/package.patch)
===================================================================
--- community-testing-any/package.patch (rev 0)
+++ community-testing-any/package.patch 2016-10-20 12:15:15 UTC (rev 192728)
@@ -0,0 +1,40 @@
+--- src/sage/misc/package.py.orig 2014-11-23 15:58:13.000000000 +0100
++++ src/sage/misc/package.py 2015-01-22 20:32:25.651383902 +0100
+@@ -343,7 +343,7 @@
+ sage: for pkg in list_packages('pip', local=True):
+ ....: assert not is_package_installed(pkg)
+ """
+- return any(p.split('-')[0] == package for p in installed_packages(exclude_pip))
++ return True
+
+ def package_versions(package_type, local=False):
+ r"""
+--- src/sage_setup/optional_extension.py.orig 2016-10-19 18:35:10.092577510 +0000
++++ src/sage_setup/optional_extension.py 2016-10-19 18:38:13.514765366 +0000
+@@ -21,8 +21,6 @@
+ from distutils.extension import Extension
+ from sage.misc.package import is_package_installed, list_packages
+
+-all_packages = list_packages(local=True)
+-
+
+ class CythonizeExtension(Extension):
+ """
+@@ -75,15 +73,7 @@
+ try:
+ condition = kwds.pop("condition")
+ except KeyError:
+- pkg = kwds.pop("package")
+- try:
+- pkginfo = all_packages[pkg]
+- except KeyError:
+- # Might be an installed old-style package
+- condition = is_package_installed(pkg)
+- else:
+- condition = (pkginfo["installed_version"] == pkginfo["remote_version"])
+-
++ condition = True
+ if condition:
+ return Extension(*args, **kwds)
+ else:
+
Copied: sagemath-doc/repos/community-testing-any/sagemath-singular4.patch (from rev 192727, sagemath-doc/trunk/sagemath-singular4.patch)
===================================================================
--- community-testing-any/sagemath-singular4.patch (rev 0)
+++ community-testing-any/sagemath-singular4.patch 2016-10-20 12:15:15 UTC (rev 192728)
@@ -0,0 +1,3731 @@
+diff --git a/src/bin/sage b/src/bin/sage
+index 46da103..96de4bc 100755
+--- a/src/bin/sage
++++ b/src/bin/sage
+@@ -472,7 +472,7 @@ fi
+
+ if [ "$1" = '-singular' -o "$1" = '--singular' ]; then
+ shift
+- exec singular "$@"
++ exec Singular "$@"
+ fi
+
+ if [ "$1" = '-sqlite3' -o "$1" = '--sqlite3' ]; then
+diff --git a/src/doc/de/tutorial/interfaces.rst b/src/doc/de/tutorial/interfaces.rst
+index c452b11..037cfc3 100644
+--- a/src/doc/de/tutorial/interfaces.rst
++++ b/src/doc/de/tutorial/interfaces.rst
+@@ -197,6 +197,7 @@ Sages Singular-Schnittstelle (ohne die ``....:``):
+
+ sage: R1 = singular.ring(0, '(x,y)', 'dp')
+ sage: R1
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+diff --git a/src/doc/en/constructions/rings.rst b/src/doc/en/constructions/rings.rst
+index d301a38..58abf8a 100644
+--- a/src/doc/en/constructions/rings.rst
++++ b/src/doc/en/constructions/rings.rst
+@@ -56,6 +56,7 @@ Here's an example using the Singular interface:
+ sage: R = singular.ring(97, '(a,b,c,d)', 'lp')
+ sage: I = singular.ideal(['a+b+c+d', 'ab+ad+bc+cd', 'abc+abd+acd+bcd', 'abcd-1'])
+ sage: R
++ polynomial ring, over a field, global ordering
+ // characteristic : 97
+ // number of vars : 4
+ // block 1 : ordering lp
+diff --git a/src/doc/en/developer/coding_in_other.rst b/src/doc/en/developer/coding_in_other.rst
+index 6432644..f40cbc3 100644
+--- a/src/doc/en/developer/coding_in_other.rst
++++ b/src/doc/en/developer/coding_in_other.rst
+@@ -401,6 +401,7 @@ interface to Singular::
+
+ sage: singular.LIB("brnoeth.lib")
+ sage: singular.ring(5,'(x,y)','lp')
++ polynomial ring, over a field, global ordering
+ // characteristic : 5
+ // number of vars : 2
+ // block 1 : ordering lp
+diff --git a/src/doc/en/tutorial/interfaces.rst b/src/doc/en/tutorial/interfaces.rst
+index eeb98ed..3cd29da 100644
+--- a/src/doc/en/tutorial/interfaces.rst
++++ b/src/doc/en/tutorial/interfaces.rst
+@@ -196,6 +196,7 @@ Singular (do not type the ``....:``):
+
+ sage: R1 = singular.ring(0, '(x,y)', 'dp')
+ sage: R1
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+diff --git a/src/doc/fr/tutorial/interfaces.rst b/src/doc/fr/tutorial/interfaces.rst
+index a1fc5cf..6d4dde9 100644
+--- a/src/doc/fr/tutorial/interfaces.rst
++++ b/src/doc/fr/tutorial/interfaces.rst
+@@ -198,6 +198,7 @@ fournie par Sage (n'entrez pas les ``....:``) :
+
+ sage: R1 = singular.ring(0, '(x,y)', 'dp')
+ sage: R1
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+diff --git a/src/doc/ja/tutorial/interfaces.rst b/src/doc/ja/tutorial/interfaces.rst
+index 99158bb..18e83e9 100644
+--- a/src/doc/ja/tutorial/interfaces.rst
++++ b/src/doc/ja/tutorial/interfaces.rst
+@@ -172,6 +172,7 @@ Singularは，グレブナー基底，多変数多項式のgcd，平面曲線の
+
+ sage: R1 = singular.ring(0, '(x,y)', 'dp')
+ sage: R1
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+diff --git a/src/doc/pt/tutorial/interfaces.rst b/src/doc/pt/tutorial/interfaces.rst
+index 7feea55..4aabfa6 100644
+--- a/src/doc/pt/tutorial/interfaces.rst
++++ b/src/doc/pt/tutorial/interfaces.rst
+@@ -196,6 +196,7 @@ digite ``...``):
+
+ sage: R1 = singular.ring(0, '(x,y)', 'dp')
+ sage: R1
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+diff --git a/src/doc/ru/tutorial/interfaces.rst b/src/doc/ru/tutorial/interfaces.rst
+index 4be09f9..41b04ca 100644
+--- a/src/doc/ru/tutorial/interfaces.rst
++++ b/src/doc/ru/tutorial/interfaces.rst
+@@ -190,6 +190,7 @@ Singular предоставляет массивную и продуманную
+
+ sage: R1 = singular.ring(0, '(x,y)', 'dp')
+ sage: R1
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+diff --git a/src/module_list.py b/src/module_list.py
+index 0dee41b..ec842b7 100644
+--- a/src/module_list.py
++++ b/src/module_list.py
+@@ -58,6 +58,12 @@ linbox_libs = list(linbox_pc['libraries'])
+ linbox_library_dirs = list(linbox_pc['library_dirs'])
+ linbox_cflags = pkgconfig.cflags('linbox').split()
+
++# Singular
++singular_pc = pkgconfig.parse('Singular')
++singular_libs = list(singular_pc['libraries'])
++singular_library_dirs = list(singular_pc['library_dirs'])
++singular_cflags = pkgconfig.cflags('Singular').split()
++
+ # PNG image library
+ png_pc = pkgconfig.parse('libpng')
+ png_libs = list(png_pc['libraries'])
+@@ -88,6 +94,9 @@ aliases = dict(
+ LINBOX_CFLAGS=linbox_cflags,
+ LINBOX_LIBRARIES=linbox_libs,
+ LINBOX_LIBDIR=linbox_library_dirs,
++ SINGULAR_CFLAGS=singular_cflags,
++ SINGULAR_LIBRARIES=singular_libs,
++ SINGULAR_LIBDIR=singular_library_dirs
+ )
+
+ #########################################################
+@@ -112,12 +121,6 @@ except ValueError:
+ pass
+
+ #########################################################
+-### Singular
+-#########################################################
+-
+-singular_libs = ['singular', 'flint', 'ntl', 'gmpxx', 'gmp', 'readline', 'm']
+-
+-#########################################################
+ ### Library order
+ #########################################################
+
+@@ -130,8 +133,8 @@ singular_libs = ['singular', 'flint', 'ntl', 'gmpxx', 'gmp', 'readline', 'm']
+ # listed here will be added at the end of the list (without changing
+ # their relative order). There is one exception: stdc++ is always put
+ # at the very end of the list.
+-library_order_list = [
+- "singular", "ec", "ecm",
++library_order_list = singular_libs + [
++ "ec", "ecm",
+ ] + linbox_libs + gsl_libs + [
+ "pari", "flint", "ratpoints", "ecl", "glpk", "ppl",
+ "arb", "mpfi", "mpfr", "mpc", "gmp", "gmpxx",
+@@ -190,20 +193,7 @@ ext_modules = [
+ language='c++',
+ libraries = ["flint", "gmp", "gmpxx", "m", "ntl"]),
+
+- Extension('sage.algebras.letterplace.free_algebra_letterplace',
+- sources = ['sage/algebras/letterplace/free_algebra_letterplace.pyx'],
+- libraries = singular_libs,
+- language="c++"),
+-
+- Extension('sage.algebras.letterplace.free_algebra_element_letterplace',
+- sources = ['sage/algebras/letterplace/free_algebra_element_letterplace.pyx'],
+- libraries = singular_libs,
+- language="c++"),
+-
+- Extension('sage.algebras.letterplace.letterplace_ideal',
+- sources = ['sage/algebras/letterplace/letterplace_ideal.pyx'],
+- libraries = singular_libs,
+- language="c++"),
++ Extension('*', sources = ['sage/algebras/letterplace/*.pyx']),
+
+ Extension('sage.algebras.quatalg.quaternion_algebra_cython',
+ sources = ['sage/algebras/quatalg/quaternion_algebra_cython.pyx'],
+@@ -675,35 +665,7 @@ ext_modules = [
+ sources = ['sage/libs/readline.pyx'],
+ libraries = ['readline']),
+
+- Extension('sage.libs.singular.singular',
+- sources = ['sage/libs/singular/singular.pyx'],
+- libraries = singular_libs,
+- language="c++"),
+-
+- Extension('sage.libs.singular.polynomial',
+- sources = ['sage/libs/singular/polynomial.pyx'],
+- libraries = singular_libs,
+- language="c++"),
+-
+- Extension('sage.libs.singular.ring',
+- sources = ['sage/libs/singular/ring.pyx'],
+- libraries = singular_libs,
+- language="c++"),
+-
+- Extension('sage.libs.singular.groebner_strategy',
+- sources = ['sage/libs/singular/groebner_strategy.pyx'],
+- libraries = singular_libs,
+- language="c++"),
+-
+- Extension('sage.libs.singular.function',
+- sources = ['sage/libs/singular/function.pyx'],
+- libraries = singular_libs,
+- language="c++"),
+-
+- Extension('sage.libs.singular.option',
+- sources = ['sage/libs/singular/option.pyx'],
+- libraries = singular_libs,
+- language="c++"),
++ Extension('*', sources = ['sage/libs/singular/*.pyx']),
+
+ Extension('sage.libs.symmetrica.symmetrica',
+ sources = ["sage/libs/symmetrica/symmetrica.pyx"],
+@@ -970,9 +932,7 @@ ext_modules = [
+ sources = ['sage/matrix/matrix_modn_sparse.pyx']),
+
+ Extension('sage.matrix.matrix_mpolynomial_dense',
+- sources = ['sage/matrix/matrix_mpolynomial_dense.pyx'],
+- libraries = singular_libs,
+- language="c++"),
++ sources = ['sage/matrix/matrix_mpolynomial_dense.pyx']),
+
+ Extension('sage.matrix.matrix_rational_dense',
+ sources = ['sage/matrix/matrix_rational_dense.pyx'],
+@@ -1569,19 +1529,13 @@ ext_modules = [
+ sources = ['sage/rings/polynomial/multi_polynomial.pyx']),
+
+ Extension('sage.rings.polynomial.multi_polynomial_ideal_libsingular',
+- sources = ['sage/rings/polynomial/multi_polynomial_ideal_libsingular.pyx'],
+- libraries = singular_libs,
+- language="c++"),
++ sources = ['sage/rings/polynomial/multi_polynomial_ideal_libsingular.pyx']),
+
+ Extension('sage.rings.polynomial.plural',
+- sources = ['sage/rings/polynomial/plural.pyx'],
+- libraries = ['m', 'readline', 'singular', 'givaro', 'gmpxx', 'gmp'],
+- language="c++"),
++ sources = ['sage/rings/polynomial/plural.pyx']),
+
+ Extension('sage.rings.polynomial.multi_polynomial_libsingular',
+- sources = ['sage/rings/polynomial/multi_polynomial_libsingular.pyx'],
+- libraries = singular_libs,
+- language="c++"),
++ sources = ['sage/rings/polynomial/multi_polynomial_libsingular.pyx']),
+
+ Extension('sage.rings.polynomial.multi_polynomial_ring_generic',
+ sources = ['sage/rings/polynomial/multi_polynomial_ring_generic.pyx']),
+diff --git a/src/sage/arith/misc.py b/src/sage/arith/misc.py
+index a7fa5a1..c943bc5 100644
+--- a/src/sage/arith/misc.py
++++ b/src/sage/arith/misc.py
+@@ -3246,7 +3246,7 @@ def binomial(x, m, **kwds):
+
+ sage: K.<x,y> = Integers(7)[]
+ sage: binomial(y,3)
+- -y^3 + 3*y^2 - 2*y
++ 6*y^3 + 3*y^2 + 5*y
+ sage: binomial(y,3).parent()
+ Multivariate Polynomial Ring in x, y over Ring of integers modulo 7
+
+diff --git a/src/sage/categories/pushout.py b/src/sage/categories/pushout.py
+index 60dfc3a..37a0914 100644
+--- a/src/sage/categories/pushout.py
++++ b/src/sage/categories/pushout.py
+@@ -3201,6 +3201,7 @@ class BlackBoxConstructionFunctor(ConstructionFunctor):
+ sage: FG(ZZ).parent()
+ Gap
+ sage: FS(QQ['t'])
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+diff --git a/src/sage/interfaces/expect.py b/src/sage/interfaces/expect.py
+index f9de7d0..c86a9bd 100644
+--- a/src/sage/interfaces/expect.py
++++ b/src/sage/interfaces/expect.py
+@@ -1212,6 +1212,7 @@ If this all works, you can then make calls like:
+
+ sage: R.<x> = QQ[]; f = x^3 + x + 1; g = x^3 - x - 1; r = f.resultant(g); gap(ZZ); singular(R)
+ Integers
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+diff --git a/src/sage/interfaces/interface.py b/src/sage/interfaces/interface.py
+index 816acfa..95b4a91 100644
+--- a/src/sage/interfaces/interface.py
++++ b/src/sage/interfaces/interface.py
+@@ -733,6 +733,7 @@ class InterfaceElement(Element):
+ PolynomialRing( Rationals, ["x"] )
+ sage: S = singular.ring(0, ('x'))
+ sage: loads(dumps(S))
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+diff --git a/src/sage/interfaces/singular.py b/src/sage/interfaces/singular.py
+index 5ebe7d2..0887e0c 100644
+--- a/src/sage/interfaces/singular.py
++++ b/src/sage/interfaces/singular.py
+@@ -64,6 +64,7 @@ factorization::
+
+ sage: R1 = singular.ring(0, '(x,y)', 'dp')
+ sage: R1
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+@@ -241,6 +242,7 @@ Groebner basis for some ideal, using Singular through Sage.
+
+ sage: singular.lib('poly.lib')
+ sage: singular.ring(32003, '(a,b,c,d,e,f)', 'lp')
++ polynomial ring, over a field, global ordering
+ // characteristic : 32003
+ // number of vars : 6
+ // block 1 : ordering lp
+@@ -611,6 +613,7 @@ class Singular(ExtraTabCompletion, Expect):
+ // dimension (affine) = 0
+ // degree (affine) = 8
+ // ** right side is not a datum, assignment ignored
++ ...
+
+ rather than ignored
+
+@@ -995,6 +998,7 @@ class Singular(ExtraTabCompletion, Expect):
+
+ sage: R = singular.ring(0, '(x,y,z)', 'dp')
+ sage: R
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 3
+ // block 1 : ordering dp
+@@ -1034,7 +1038,7 @@ class Singular(ExtraTabCompletion, Expect):
+ sage: R = singular.ring(7, '(a,b)', 'ds')
+ sage: S = singular.ring('real', '(a,b)', 'lp')
+ sage: singular.new('10*a')
+- 1.000e+01*a
++ (1.000e+01)*a
+ sage: R.set_ring()
+ sage: singular.new('10*a')
+ 3*a
+@@ -1074,6 +1078,7 @@ class Singular(ExtraTabCompletion, Expect):
+ sage: R = singular.ring(7, '(a,b)', 'ds')
+ sage: S = singular.ring('real', '(a,b)', 'lp')
+ sage: singular.current_ring()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0 (real)
+ // number of vars : 2
+ // block 1 : ordering lp
+@@ -1081,6 +1086,7 @@ class Singular(ExtraTabCompletion, Expect):
+ // block 2 : ordering C
+ sage: singular.set_ring(R)
+ sage: singular.current_ring()
++ polynomial ring, over a field, local/mixed ordering
+ // characteristic : 7
+ // number of vars : 2
+ // block 1 : ordering ds
+@@ -1122,12 +1128,14 @@ class Singular(ExtraTabCompletion, Expect):
+
+ sage: r = PolynomialRing(GF(127),3,'xyz', order='invlex')
+ sage: r._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 127
+ // number of vars : 3
+ // block 1 : ordering rp
+ // : names x y z
+ // block 2 : ordering C
+ sage: singular.current_ring()
++ polynomial ring, over a field, global ordering
+ // characteristic : 127
+ // number of vars : 3
+ // block 1 : ordering rp
+@@ -1345,6 +1353,7 @@ class SingularElement(ExtraTabCompletion, ExpectElement):
+ sage: cpQ=copy(Q)
+ sage: cpQ.set_ring()
+ sage: cpQ
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+@@ -1600,7 +1609,10 @@ class SingularElement(ExtraTabCompletion, ExpectElement):
+ # using Singular's term order
+ from sage.rings.polynomial.term_order import termorder_from_singular
+ from sage.all import PolynomialRing
+- if singular.eval('typeof(basering)')=='ring':
++ # Meanwhile Singulars quotient rings are also of 'ring' type, not 'qring' as it was in the past.
++ # To find out if a singular ring is a quotient ring or not checking for ring type does not help
++ # and instead of that we we check if the quotient ring is zero or not:
++ if (singular.eval('ideal(basering)==0')=='1'):
+ return PolynomialRing(BR, names=singular.eval('varstr(basering)'), order=termorder_from_singular(singular))
+ P = PolynomialRing(BR, names=singular.eval('varstr(basering)'), order=termorder_from_singular(singular))
+ return P.quotient(singular('ringlist(basering)[4]')._sage_(P), names=singular.eval('varstr(basering)'))
+@@ -1722,11 +1734,18 @@ class SingularElement(ExtraTabCompletion, ExpectElement):
+ singular_poly_list = self.parent().eval("string(coef(%s,%s))"%(\
+ self.name(),variable_str)).split(",")
+
+- if singular_poly_list == ['1','0'] :
+- return R(0)
++ # Directly treat constants
++ if singular_poly_list[0] in ['1', '(1.000e+00)']:
++ return R(singular_poly_list[1])
+
+ coeff_start = len(singular_poly_list) // 2
+
++ # Singular 4 puts parentheses around floats and sign outside them
++ charstr = self.parent().eval('charstr(basering)').split(',',1)
++ if charstr[0] in ['real', 'complex']:
++ for i in range(coeff_start, 2*coeff_start):
++ singular_poly_list[i] = singular_poly_list[i].replace('(','').replace(')','')
++
+ if isinstance(R,(MPolynomialRing_polydict,QuotientRing_generic)) and (ring_is_fine or can_convert_to_singular(R)):
+ # we need to lookup the index of a given variable represented
+ # through a string
+@@ -1778,7 +1797,7 @@ class SingularElement(ExtraTabCompletion, ExpectElement):
+ exp = int(1)
+
+ if kcache is None:
+- sage_repr[exp]=k(singular_poly_list[coeff_start+i])
++ sage_repr[exp] = k(singular_poly_list[coeff_start+i])
+ else:
+ elem = singular_poly_list[coeff_start+i]
+ if elem not in kcache:
+@@ -1861,7 +1880,7 @@ class SingularElement(ExtraTabCompletion, ExpectElement):
+ ::
+
+ sage: singular.eval('ring R = integer, (x,y,z),lp')
+- '// ** redefining R **'
++ '// ** redefining R (ring R = integer, (x,y,z),lp;)'
+ sage: I = singular.ideal(['x^2','y*z','z+x'])
+ sage: I.sage()
+ Ideal (x^2, y*z, x + z) of Multivariate Polynomial Ring in x, y, z over Integer Ring
+@@ -1883,7 +1902,8 @@ class SingularElement(ExtraTabCompletion, ExpectElement):
+ Note that the current base ring has not been changed by asking for another ring::
+
+ sage: singular('basering')
+- // coeff. ring is : Integers
++ polynomial ring, over a domain, global ordering
++ // coeff. ring is : integer
+ // number of vars : 3
+ // block 1 : ordering lp
+ // : names x y z
+@@ -1967,6 +1987,7 @@ class SingularElement(ExtraTabCompletion, ExpectElement):
+ sage: R = singular.ring(7, '(a,b)', 'ds')
+ sage: S = singular.ring('real', '(a,b)', 'lp')
+ sage: singular.current_ring()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0 (real)
+ // number of vars : 2
+ // block 1 : ordering lp
+@@ -1974,6 +1995,7 @@ class SingularElement(ExtraTabCompletion, ExpectElement):
+ // block 2 : ordering C
+ sage: R.set_ring()
+ sage: singular.current_ring()
++ polynomial ring, over a field, local/mixed ordering
+ // characteristic : 7
+ // number of vars : 2
+ // block 1 : ordering ds
+@@ -2229,6 +2251,7 @@ def reduce_load():
+ By :trac:`18848`, pickling actually often works::
+
+ sage: loads(dumps(singular.ring()))
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -2252,13 +2275,15 @@ def generate_docstring_dictionary():
+ sage: from sage.interfaces.singular import generate_docstring_dictionary
+ sage: generate_docstring_dictionary()
+ """
++ from sage.env import SAGE_LOCAL
++
+ global nodes
+ global node_names
+
+ nodes.clear()
+ node_names.clear()
+
+- singular_docdir = os.environ["SAGE_LOCAL"]+"/share/singular/"
++ singular_docdir = SAGE_LOCAL+"/share/singular/"
+
+ new_node = re.compile("File: singular\.hlp, Node: ([^,]*),.*")
+ new_lookup = re.compile("\* ([^:]*):*([^.]*)\..*")
+diff --git a/src/sage/interfaces/tests.py b/src/sage/interfaces/tests.py
+index e41f15c..af9797a 100644
+--- a/src/sage/interfaces/tests.py
++++ b/src/sage/interfaces/tests.py
+@@ -39,7 +39,7 @@ Test that write errors to stderr are handled gracefully by GAP
+ 0
+ sage: subprocess.call("echo syntax error | ipython", **kwds) in (0,1)
+ True
+- sage: subprocess.call("echo syntax error | singular", **kwds)
++ sage: subprocess.call("echo syntax error | Singular", **kwds)
+ 0
+ """
+ from __future__ import print_function
+diff --git a/src/sage/libs/singular/decl.pxd b/src/sage/libs/singular/decl.pxd
+index 7a5af56..8235e9d 100644
+--- a/src/sage/libs/singular/decl.pxd
++++ b/src/sage/libs/singular/decl.pxd
+@@ -1,3 +1,8 @@
++# distutils: extra_compile_args = SINGULAR_CFLAGS
++# distutils: libraries = SINGULAR_LIBRARIES
++# distutils: library_dirs = SINGULAR_LIBDIR
++# distutils: language = c++
++
+ """
+ Declarations of Singular's C/C++ Functions
+
+@@ -25,9 +30,6 @@ AUTHOR:
+
+ from sage.libs.gmp.types cimport mpz_t, mpz_ptr
+
+-cdef extern from "factor.h":
+- cdef int libfac_interruptflag
+-
+ cdef extern from "factory/factory.h":
+
+ #
+@@ -45,15 +47,14 @@ cdef extern from "factory/factory.h":
+ cdef int SW_USE_NTL_GCD_P
+ cdef int SW_USE_NTL_SORT
+
+-
+-cdef extern from "libsingular.h":
++cdef extern from "singular/Singular/libsingular.h":
+
+ #
+ # OPTIONS
+ #
+
+- cdef unsigned int singular_options "test"
+- cdef unsigned int singular_verbose_options "verbose"
++ cdef unsigned int singular_options "si_opt_1" # previously 'test'
++ cdef unsigned int singular_verbose_options "si_opt_2" # previously 'verbose'
+
+ # actual options
+ cdef int OPT_PROT
+@@ -116,56 +117,81 @@ cdef extern from "libsingular.h":
+ mpz_t n
+ int s
+
+- # finite extension field elements
++ # See singular/libpolys/coeffs/coeffs.h for documentation
++ cdef enum n_coeffType:
++ n_unknown
++ n_Zp
++ n_Q
++ n_R
++ n_GF
++ n_long_R
++ n_algExt
++ n_transExt
++ n_long_C
++ n_Z
++ n_Zn
++ n_Znm
++ n_Z2m
++ n_CF
+
+- ctypedef struct napoly "polyrec"
++ ctypedef struct ring "ip_sring"
++ ctypedef struct AlgExtInfo
+
+- # algebraic numbers
++ ctypedef struct n_Procs_s:
+
+- ctypedef struct lnumber "slnumber":
+- napoly *z
+- napoly *n
+- int s
++ number* cfDiv(number *, number *, const n_Procs_s* r)
++ number* cfAdd(number *, number *, const n_Procs_s* r) # algebraic number addition
++ number* cfSub(number *, number *, const n_Procs_s* r)
++ number* cfMult(number *, number *, const n_Procs_s* r) # algebraic number multiplication
+
+- ctypedef struct ring "ip_sring"
++ number* (*cfInit)(int i, const n_Procs_s* r ) # algebraic number from int
++ number* (*cfParameter)(int i, const n_Procs_s* r)
++ int (*cfParDeg)(number* n, const n_Procs_s* r)
++ int (*cfSize)(number* n, const n_Procs_s* r)
++ int (*cfInt)(number* n, const n_Procs_s* r)
++ int (*cdDivComp)(number* a,number* b, const n_Procs_s* r)
++ number* (*cfGetUnit)(number* a, const n_Procs_s* r)
++ number* (*cfExtGcd)(number* a, number* b, number* *s, number* *t , const n_Procs_s* r)
+
+- ctypedef struct n_Procs_s:
++ void (*cfDelete)(number **, const n_Procs_s*)
++
++ number* (*cfInpNeg)(number* a, const n_Procs_s* r)
++ number* (*cfInvers)(number* a, const n_Procs_s* r)
++ number* (*cfCopy)(number* a, const n_Procs_s* r) # deep copy of algebraic number
++ number* (*cfRePart)(number* a, const n_Procs_s* cf)
++ number* (*cfImPart)(number* a, const n_Procs_s* cf)
++ void (*cfWrite)(number* a, const n_Procs_s* r)
++ void (*cfNormalize)(number* a, const n_Procs_s* r)
+
+- number* nDiv(number *, number *)
+- number* nAdd(number *, number *)
+- number* nSub(number *, number *)
+- number* nMul(number *, number *)
+-
+- void (*nNew)(number* * a)
+- number* (*nInit)(int i)
+- number* (*nPar)(int i)
+- int (*nParDeg)(number* n)
+- int (*nSize)(number* n)
+- int (*n_Int)(number* n, ring *)
+- int (*nDivComp)(number* a,number* b)
+- number* (*nGetUnit)(number* a)
+- number* (*nExtGcd)(number* a, number* b, number* *s, number* *t)
+-
+- number* (*nNeg)(number* a)
+- number* (*nInvers)(number* a)
+- number* (*nCopy)(number* a)
+- number* (*nRePart)(number* a)
+- number* (*nImPart)(number* a)
+- void (*nWrite)(number* a)
+- void (*nNormalize)(number* a)
+-
+- bint (*nDivBy)(number* a, number* b)
+- bint (*nEqual)(number* a,number* b)
+- bint (*nIsZero)(number* a)
+- bint (*nIsOne)(number* a)
+- bint (*nIsMOne)(number* a)
+- bint (*nGreaterZero)(number* a)
+- void (*nPower)(number* a, int i, number* * result)
++
++
++ bint (*cfDivBy)(number* a, number* b, const n_Procs_s* r)
++ bint (*cfEqual)(number* a,number* b, const n_Procs_s* )
++ bint (*cfIsZero)(number* a, const n_Procs_s* ) # algebraic number comparison with zero
++ bint (*cfIsOne)(number* a, const n_Procs_s* ) # algebraic number comparison with one
++ bint (*cfIsMOne)(number* a, const n_Procs_s* )
++ bint (*cfGreaterZero)(number* a, const n_Procs_s* )
++ void (*cfPower)(number* a, int i, number* * result, const n_Procs_s* r) # algebraic number power
++
++
++ ring *extRing
++ int ch
++ mpz_ptr modBase;
++ unsigned long modExponent;
++
++ #n_coeffType type
++ int type
+
+ # polynomials
+
++ const char ** n_ParameterNames(const n_Procs_s* r)
++
++ int n_NumberOfParameters(const n_Procs_s* r)
++
+ ctypedef struct poly "polyrec":
+ poly *next
++ number *coef
++ unsigned long exp[1]
+
+ # ideals
+
+@@ -193,22 +219,33 @@ cdef extern from "libsingular.h":
+ p_Procs_s *p_Procs #polxnomial procs
+ ideal *qideal #quotient ideal
+
+- char **parameter # parameter names
+- ring *algring # base extension field
+ short N # number of variables
+- short P # number of parameters
+- int ch # characteristic (0:QQ, p:GF(p),-p:GF(q), 1:NF)
+- unsigned int ringtype # field etc.
+- mpz_ptr ringflaga
+- unsigned long ringflagb
++
+ int pCompIndex # index of components
+ unsigned long bitmask # mask for getting single exponents
+
+- n_Procs_s* cf
++
++ n_Procs_s* cf # coefficient field/ring
+ int ref
+
++ # return total degree of p
++
++ long (*pLDeg)(poly *p, int *l, ring *r)
++ long (*pLDegOrig)(poly *p, int *l, ring *r)
++ long (*pFDeg)(poly *p, ring *r)
++ long (*pFDegOrig)(poly *p, ring *r)
++
++
++ long p_Deg(poly *p, ring *r)
++ long p_WTotaldegree(poly *p, ring *r)
++ long p_Totaldegree(poly *p, ring *r)
++ long p_WDegree(poly *p, ring *r)
++
+ # available ring orders
+
++ ctypedef struct AlgExtInfo:
++ ring * r
++
+ cdef enum rRingOrder_t:
+ ringorder_no
+ ringorder_a
+@@ -368,7 +405,6 @@ cdef extern from "libsingular.h":
+
+ cdef ring *currRing
+ cdef ideal *currQuotient
+-
+ # omalloc bin for numbers
+
+ cdef omBin *rnumber_bin
+@@ -393,7 +429,7 @@ cdef extern from "libsingular.h":
+ cdef idhdl *currRingHdl
+
+ cdef int errorreported
+- cdef int verbose
++ cdef int si_opt_2 # previously 'verbose'
+ cdef void * currentVoice
+ cdef int myynest
+
+@@ -408,6 +444,10 @@ cdef extern from "libsingular.h":
+
+ int siInit(char *)
+
++ ctypedef short (*cfInitCharProc)(coeffs, void *)
++
++ n_coeffType nRegister(n_coeffType n, cfInitCharProc p)
++
+ # external resource init
+
+ void feInitResources(char *name)
+@@ -439,7 +479,25 @@ cdef extern from "libsingular.h":
+
+ # construct ring with characteristic, number of vars and names
+
+- ring *rDefault(int char, int nvars, char **names)
++ ring *rDefault(int char , int nvars, char **names)
++ ring *rDefault(const n_Procs_s* cf, int nvars, char **names)
++ ring *rDefault(int ch , int nvars, char **names,int ord_size, int *ord, int *block0, int *block1, int **wvhdl)
++ ring *rDefault(const n_Procs_s* cf, int nvars, char **names,int ord_size, int *ord, int *block0, int *block1, int **wvhdl)
++
++
++
++
++ # see coeffs.h
++ ctypedef struct GFInfo:
++ int GFChar;
++ int GFDegree;
++ const char* GFPar_name;
++
++
++ # parameter is pointer to gGFInfo
++ #
++ n_Procs_s* nInitChar(n_coeffType t, void * parameter)
++
+
+ # ring destructor
+
+@@ -541,7 +599,7 @@ cdef extern from "libsingular.h":
+
+ # return whether a polynomial is homogenous
+
+- int pIsHomogeneous(poly *p)
++ int p_IsHomogeneous(poly *p, const ring *r)
+
+ # return string representation of p
+
+@@ -614,6 +672,8 @@ cdef extern from "libsingular.h":
+
+ long p_Totaldegree(poly *p, ring *r)
+
++ long pLDeg1_Totaldegree(poly * p,int *l, ring * r)
++
+ # iterate through the monomials of p
+
+ poly *pNext(poly *p)
+@@ -651,29 +711,26 @@ cdef extern from "libsingular.h":
+
+ # gcd of f and g
+
+- poly *singclap_gcd ( poly *f, poly *g )
++ poly *singclap_gcd ( poly *f, poly *g, ring * r )
+
+ # resultant of f and g in x
+
+- poly *singclap_resultant ( poly *f, poly *g , poly *x)
++ poly *singclap_resultant ( poly *f, poly *g , poly *x, ring * r)
+
+ # extended gcd of f and g
+
+- int singclap_extgcd( poly *f, poly *g, poly *res, poly *pa, poly *pb )
++ int singclap_extgcd( poly *f, poly *g, poly *res, poly *pa, poly *pb, ring * r )
+
+ # full polynomial division (as opposed to monomial division)
+
+- poly *singclap_pdivide ( poly *f, poly *g )
++ poly *singclap_pdivide ( poly *f, poly *g, ring * r )
+
+ # factorization
+
+- ideal *singclap_factorize ( poly *f, intvec ** v , int with_exps)
+-
+- # TRUE if p is square free
+- int singclap_isSqrFree(poly *p)
++ ideal *singclap_factorize ( poly *f, intvec ** v , int with_exps, ring * r)
+
+ # return determinant of i
+- poly *singclap_det(matrix *i)
++ poly *singclap_det(matrix *i, ring * r)
+
+ # normal form calculation of p with respect to i, q is quotient
+ # ring.
+@@ -685,9 +742,7 @@ cdef extern from "libsingular.h":
+
+ poly *pDiff(poly *p, int i)
+
+- # return total degree of p
+
+- int (*pLDeg)(poly *p, int *l, ring *r)
+
+ # TRUE if p is a vector
+
+@@ -716,13 +771,11 @@ cdef extern from "libsingular.h":
+
+ number *nlRInit(int)
+
+- # rational number from numerator and denominator
+
+- number *nlInit2gmp(mpz_t n, mpz_t d)
+
+ # rational number from numerator and denominator
+
+- number *nlInit2(int i, int j)
++ number *nlInit2(int i, int j,const n_Procs_s* cf)
+
+ # simplify rational number (cancel common factors)
+
+@@ -732,65 +785,6 @@ cdef extern from "libsingular.h":
+
+ number *nlCopy(number *)
+
+- # get numerator
+-
+- number *nlGetNumerator(number *n, ring *r)
+-
+- # get denominator
+-
+- number *nlGetDenom(number *n, ring *r)
+-
+- # delete rational number
+-
+- void nlDelete(number **n, ring *r)
+-
+- # i-th algebraic number paraemeter
+-
+- number *naPar(int i)
+-
+- # algebraic number power
+-
+- void naPower(number *, int, number **)
+-
+- # algebraic number multiplication
+-
+- number *naMult(number *, number *)
+-
+- # algebraic number addition
+-
+- number *naAdd(number *, number *)
+-
+- # deep copy of algebraic number
+-
+- number *naCopy(number *)
+-
+- # algebraic number from int
+-
+- number *naInit(int, ring *r)
+-
+- # algebraic number destructor
+-
+- void naDelete(number **, ring*)
+-
+- # algebraic number comparison with zero
+-
+- int naIsZero(number *)
+-
+- # algebraic number comparison with one
+-
+- int naIsOne(number *)
+-
+- # get current coefficent
+-
+- number *napGetCoeff(napoly *z)
+-
+- # get exponent of i-th variable
+-
+- int napGetExpFrom(napoly *, int i, ring* r)
+-
+- # normalize a number
+-
+- void naNormalize(number *)
+
+ # number to integer handle
+
+@@ -800,19 +794,6 @@ cdef extern from "libsingular.h":
+
+ long SR_HDL(number *)
+
+- # map Q -> Q(a)
+- number *naMap00(number *c)
+-
+- # init integer
+- number *nrzInit(int i, ring *r)
+-
+- # init ZmodN from GMP
+- number *nrnMapGMP(number *v)
+-
+- #init 2^m from a long
+- number *nr2mMapZp(number *)
+-
+-
+ # get C int from ZmodN
+ int nrnInt(number *v)
+
+@@ -824,9 +805,6 @@ cdef extern from "libsingular.h":
+
+ void id_Delete(ideal **, ring *)
+
+- # mappinf from ideal i1 in r1 by i2 to r2
+-
+- ideal *fast_map(ideal *i1, ring *r1, ideal *i2, ring *r2)
+
+ # lifting
+
+@@ -842,7 +820,7 @@ cdef extern from "libsingular.h":
+
+ # rank of free module for m
+
+- long idRankFreeModule(ideal *m, ring *r)
++ long id_RankFreeModule(ideal *m, ring *r)
+
+ # buchberger's algorithm
+
+@@ -1003,54 +981,127 @@ cdef extern from "libsingular.h":
+ void setFlag(leftv *A, int F)
+ void resetFlag(leftv *A, int F)
+
+-cdef extern from "singular/prCopy.h":
++
++
++
++cdef extern from "singular/coeffs/rmodulo2m.h":
++
++ #init 2^m from a long
++ number *nr2mMapZp(number *,const n_Procs_s* src,const n_Procs_s* dst)
++
++
++cdef extern from "singular/kernel/maps/fast_maps.h":
++
++ # mappinf from ideal i1 in r1 by i2 to r2
++
++ ideal *fast_map_common_subexp(ideal *i1, ring *r1, ideal *i2, ring *r2)
++
++
++
++cdef extern from "singular/polys/ext_fields/algext.h":
++
++ naInitChar(n_Procs_s* cf, void * infoStruct)
++
++ ctypedef number* (*nMapFunc)(number *c,const n_Procs_s* src,const n_Procs_s* dst)
++
++ nMapFunc naSetMap(const n_Procs_s* src, const n_Procs_s* dst)
++
++cdef extern from "singular/coeffs/rmodulon.h":
++
++ # init ZmodN from GMP
++ number *nrnMapGMP(number *v,const n_Procs_s* src,const n_Procs_s* dst)
++
++ nMapFunc nrnSetMap(const n_Procs_s* src,const n_Procs_s* dst)
++
++cdef extern from "singular/coeffs/rmodulon.h":
++ # see rmodulon.h
++
++ ctypedef struct ZnmInfo:
++ mpz_ptr base;
++ unsigned long exp;
++
++
++cdef extern from "singular/coeffs/rintegers.h":
++
++ # init integer
++ number *nrzInit(int i, const n_Procs_s* cf)
++
++
++cdef extern from "singular/polys/weight.h":
++
++
++ double wFunctionalBuch(int *degw, int *lpol, int npol, double *rel, double wx, double wNsqr)
++
++
++cdef extern from "singular/polys/prCopy.h":
+ poly *prCopyR_NoSort(poly *p, ring *r, ring *dest_r)
+ poly *prCopyR(poly *p, ring *r, ring *dest_r)
+
+ cdef int LANG_TOP
+
++cdef extern from "singular/polys/nc/nc.h":
+ # Non-commutative functions
+ ctypedef enum nc_type:
+- nc_error # Something's gone wrong!
+- nc_general # yx=q xy+...
+- nc_skew # yx=q xy
+- nc_comm # yx= xy
+- nc_lie, # yx=xy+...
+- nc_undef, # for internal reasons */
+- nc_exterior #
++ nc_error
++ nc_general
++ nc_skew
++ nc_comm
++ nc_lie
++ nc_undef
++ nc_exterior
+
+-
+-cdef extern from "singular/gring.h":
+ void ncRingType(ring *, nc_type)
+ nc_type ncRingType_get "ncRingType" (ring *)
+ int nc_CallPlural(matrix* CC, matrix* DD, poly* CN, poly* DN, ring* r)
+ bint nc_SetupQuotient(ring *, ring *, bint)
+
+-cdef extern from "singular/sca.h":
++
++cdef extern from "singular/coeffs/longrat.h":
++
++ # get numerator
++
++ number *nlGetNumerator(number *n, const n_Procs_s* cf)
++
++ # get denominator
++
++ number *nlGetDenom(number *n, const n_Procs_s* cf)
++
++
++ # rational number from numerator and denominator
++
++ number *nlInit2gmp(mpz_t n, mpz_t d,const n_Procs_s* cf)
++
++
++ # delete rational number
++
++ void nlDelete(number **n, const n_Procs_s* cf)
++
++
++cdef extern from "singular/polys/nc/sca.h":
+ void sca_p_ProcsSet(ring *, p_Procs_s *)
+ void scaFirstAltVar(ring *, int)
+ void scaLastAltVar(ring *, int)
+
+-cdef extern from "singular/ring.h":
++cdef extern from "singular/polys/monomials/ring.h":
+ bint rIsPluralRing(ring* r)
+ void rPrint "rWrite"(ring* r)
+ char* rOrderingString "rOrdStr"(ring* r)
+ void pDebugPrint "p_DebugPrint" (poly*p, ring* r)
+
+-cdef extern from "singular/stairc.h":
++cdef extern from "singular/kernel/combinatorics/stairc.h":
+ # Computes the monomial basis for R[x]/I
+ ideal *scKBase(int deg, ideal *s, ideal *Q)
+
+-cdef extern from "singular/lists.h":
++cdef extern from "singular/Singular/lists.h":
+ ctypedef struct lists "slists":
+ int nr
+ leftv *m
+ void (*Init)(int n)
+
+-cdef extern from "singular/kstd1.h":
++cdef extern from "singular/kernel/GBEngine/kstd1.h":
+ cdef extern int Kstd1_deg # degBound, default 0
+ cdef extern int Kstd1_mu # multBound, default 0
+
+-cdef extern from "singular/syz.h":
++cdef extern from "singular/kernel/GBEngine/syz.h":
+ ctypedef struct syStrategy "ssyStrategy":
+ short references
+diff --git a/src/sage/libs/singular/function.pyx b/src/sage/libs/singular/function.pyx
+index 74ecee3..9265099 100644
+--- a/src/sage/libs/singular/function.pyx
++++ b/src/sage/libs/singular/function.pyx
+@@ -43,7 +43,7 @@ available, use the :func:`lib` function as shown below::
+ sage: primdecSY = singular_function('primdecSY')
+ Traceback (most recent call last):
+ ...
+- NameError: Function 'primdecSY' is not defined.
++ NameError: Singular library function 'primdecSY' is not defined
+
+ sage: singular_lib('primdec.lib')
+ sage: primdecSY = singular_function('primdecSY')
+@@ -202,7 +202,7 @@ cdef class RingWrap:
+ sage: ring(l, ring=P).npars()
+ 0
+ """
+- return self._ring.P
++ return n_NumberOfParameters(self._ring.cf)
+
+ def ordering_string(self):
+ """
+@@ -236,7 +236,7 @@ cdef class RingWrap:
+ sage: ring(l, ring=P).par_names()
+ []
+ """
+- return [self._ring.parameter[i] for i in range(self.npars())]
++ return [n_ParameterNames(self._ring.cf)[i] for i in range(self.npars())]
+
+ def characteristic(self):
+ """
+@@ -252,7 +252,7 @@ cdef class RingWrap:
+ sage: ring(l, ring=P).characteristic()
+ 0
+ """
+- return self._ring.ch
++ return self._ring.cf.ch
+
+ def is_commutative(self):
+ """
+@@ -1061,7 +1061,7 @@ cdef class LibraryCallHandler(BaseCallHandler):
+ res = <leftv*> omAllocBin(sleftv_bin)
+ res.Init()
+ res.Copy(&iiRETURNEXPR)
+- iiRETURNEXPR.Init();
++ iiRETURNEXPR.Init()
+ return res
+ raise RuntimeError("Error raised calling singular function")
+
+@@ -1104,7 +1104,7 @@ cdef class KernelCallHandler(BaseCallHandler):
+ cdef leftv *arg2
+ cdef leftv *arg3
+
+- cdef int number_of_arguments = len(argument_list)
++ cdef Py_ssize_t number_of_arguments = len(argument_list)
+
+ # Handle functions with an arbitrary number of arguments, sent
+ # by an argument list.
+@@ -1147,7 +1147,9 @@ cdef class KernelCallHandler(BaseCallHandler):
+ global error_messages
+
+ errorreported += 1
+- error_messages.append("Wrong number of arguments")
++ error_messages.append(
++ "Wrong number of arguments (got {} arguments, arity code is {})"
++ .format(number_of_arguments, self.arity))
+ return NULL
+
+ cdef bint free_res(self):
+@@ -1184,6 +1186,7 @@ cdef class SingularFunction(SageObject):
+ currRingHdl = ggetid("my_awesome_sage_ring")
+ if currRingHdl == NULL:
+ currRingHdl = enterid("my_awesome_sage_ring", 0, RING_CMD, &IDROOT, 1)
++ currRingHdl.data.uring = <ring *>omAlloc0Bin(sip_sring_bin)
+ currRingHdl.data.uring.ref += 1
+
+ cdef BaseCallHandler get_call_handler(self):
+@@ -1248,9 +1251,9 @@ cdef class SingularFunction(SageObject):
+ sage: size(1,2)
+ Traceback (most recent call last):
+ ...
+- RuntimeError: Error in Singular function call 'size':
+- Wrong number of arguments
+- sage: size('foobar')
++ RuntimeError: error in Singular function call 'size':
++ Wrong number of arguments (got 2 arguments, arity code is 300)
++ sage: size('foobar', ring=P)
+ 6
+
+ Show the usage of the optional ``attributes`` parameter::
+@@ -1298,9 +1301,9 @@ cdef class SingularFunction(SageObject):
+ sage: _ = triangL(I)
+ Traceback (most recent call last):
+ ...
+- RuntimeError: Error in Singular function call 'triangL':
+- The input is no groebner basis.
+- leaving triang.lib::triangL
++ RuntimeError: error in Singular function call 'triangL':
++ The input is no groebner basis.
++ leaving triang.lib::triangL
+
+ sage: G= Ideal(I.groebner_basis())
+ sage: triangL(G,attributes={G:{'isSB':1}})
+@@ -1510,8 +1513,8 @@ cdef inline call_function(SingularFunction self, tuple args, object R, bint sign
+
+ if errorreported:
+ errorreported = 0
+- raise RuntimeError("Error in Singular function call '%s':\n %s"%
+- (self._name, "\n ".join(error_messages)))
++ raise RuntimeError("error in Singular function call %r:\n%s"%
++ (self._name, "\n".join(error_messages)))
+
+ res = argument_list.to_python(_res)
+
+@@ -1552,7 +1555,7 @@ cdef class SingularLibraryFunction(SingularFunction):
+ cdef BaseCallHandler get_call_handler(self):
+ cdef idhdl* singular_idhdl = ggetid(self._name)
+ if singular_idhdl==NULL:
+- raise NameError("Function '%s' is not defined."%self._name)
++ raise NameError("Singular library function {!r} is not defined".format(self._name))
+ if singular_idhdl.typ!=PROC_CMD:
+ raise ValueError("Not a procedure")
+
+@@ -1587,15 +1590,19 @@ cdef class SingularKernelFunction(SingularFunction):
+ sage: f = SingularKernelFunction("std")
+ sage: f(I)
+ [y - 1, x + 1]
++ sage: SingularKernelFunction("no_such_function")
++ Traceback (most recent call last):
++ ...
++ NameError: Singular kernel function 'no_such_function' is not defined
+ """
+ super(SingularKernelFunction,self).__init__(name)
+ self.call_handler = self.get_call_handler()
+
+ cdef BaseCallHandler get_call_handler(self):
+- cdef int cmd_n = -1
++ cdef int cmd_n = 0
+ arity = IsCmd(self._name, cmd_n) # call by reverence for CMD_n
+- if cmd_n == -1:
+- raise NameError("Function '%s' is not defined."%self._name)
++ if not cmd_n:
++ raise NameError("Singular kernel function {!r} is not defined".format(self._name))
+
+ return KernelCallHandler(cmd_n, arity)
+
+@@ -1647,18 +1654,18 @@ def singular_function(name):
+ sage: factorize()
+ Traceback (most recent call last):
+ ...
+- RuntimeError: Error in Singular function call 'factorize':
+- Wrong number of arguments
++ RuntimeError: error in Singular function call 'factorize':
++ Wrong number of arguments (got 0 arguments, arity code is 303)
+ sage: factorize(f, 1, 2)
+ Traceback (most recent call last):
+ ...
+- RuntimeError: Error in Singular function call 'factorize':
+- Wrong number of arguments
++ RuntimeError: error in Singular function call 'factorize':
++ Wrong number of arguments (got 3 arguments, arity code is 303)
+ sage: factorize(f, 1, 2, 3)
+ Traceback (most recent call last):
+ ...
+- RuntimeError: Error in Singular function call 'factorize':
+- Wrong number of arguments
++ RuntimeError: error in Singular function call 'factorize':
++ Wrong number of arguments (got 4 arguments, arity code is 303)
+
+ The Singular function ``list`` can be called with any number of
+ arguments::
+@@ -1675,10 +1682,10 @@ def singular_function(name):
+
+ We try to define a non-existing function::
+
+- sage: number_foobar = singular_function('number_foobar');
++ sage: number_foobar = singular_function('number_foobar')
+ Traceback (most recent call last):
+ ...
+- NameError: Function 'number_foobar' is not defined.
++ NameError: Singular library function 'number_foobar' is not defined
+
+ ::
+
+@@ -1809,21 +1816,22 @@ def lib(name):
+ sage: primes(2,10, ring=GF(127)['x,y,z'])
+ (2, 3, 5, 7)
+ """
+- global verbose
+- cdef int vv = verbose
++ global si_opt_2
+
+- if get_verbose() <= 0:
+- verbose &= ~Sy_bit(V_LOAD_LIB)
++ cdef int vv = si_opt_2
+
+ if get_verbose() <= 0:
+- verbose &= ~Sy_bit(V_REDEFINE)
++ si_opt_2 &= ~Sy_bit(V_LOAD_LIB)
++ si_opt_2 &= ~Sy_bit(V_REDEFINE)
+
+- cdef bint failure = iiLibCmd(omStrDup(name), 1, 1, 1)
+- verbose = vv
++ cdef char* cname = omStrDup(name)
++ sig_on()
++ cdef bint failure = iiLibCmd(cname, 1, 1, 1)
++ sig_off()
++ si_opt_2 = vv
+
+ if failure:
+- raise NameError("Library '%s' not found."%(name,))
+-
++ raise NameError("Singular library {!r} not found".format(name))
+
+
+ def list_of_functions(packages=False):
+@@ -1832,11 +1840,12 @@ def list_of_functions(packages=False):
+
+ INPUT:
+
+- - ``packages`` - include local functions in packages.
++ - ``packages`` -- include local functions in packages.
+
+ EXAMPLE::
+
+- sage: 'groebner' in sage.libs.singular.function.list_of_functions()
++ sage: from sage.libs.singular.function import list_of_functions
++ sage: 'groebner' in list_of_functions()
+ True
+ """
+ cdef list l = []
+@@ -1856,7 +1865,6 @@ def list_of_functions(packages=False):
+ return l
+
+
+-#cdef ring*?
+ cdef inline RingWrap new_RingWrap(ring* r):
+ cdef RingWrap ring_wrap_result = RingWrap.__new__(RingWrap)
+ ring_wrap_result._ring = r
+diff --git a/src/sage/libs/singular/groebner_strategy.pyx b/src/sage/libs/singular/groebner_strategy.pyx
+index b4c2be9..a5843e3 100644
+--- a/src/sage/libs/singular/groebner_strategy.pyx
++++ b/src/sage/libs/singular/groebner_strategy.pyx
+@@ -23,7 +23,7 @@ cdef extern from *: # hack to get at cython macro
+
+ from sage.libs.singular.decl cimport ideal, ring, poly, currRing
+ from sage.libs.singular.decl cimport rChangeCurrRing
+-from sage.libs.singular.decl cimport new_skStrategy, delete_skStrategy, idRankFreeModule
++from sage.libs.singular.decl cimport new_skStrategy, delete_skStrategy, id_RankFreeModule
+ from sage.libs.singular.decl cimport initEcartBBA, enterSBba, initBuchMoraCrit, initS, pNorm, id_Delete, kTest
+ from sage.libs.singular.decl cimport omfree, redNF, p_Copy, redtailBba
+
+@@ -117,7 +117,7 @@ cdef class GroebnerStrategy(SageObject):
+ cdef ideal *i = sage_ideal_to_singular_ideal(L)
+ self._strat = new_skStrategy()
+
+- self._strat.ak = idRankFreeModule(i, R._ring)
++ self._strat.ak = id_RankFreeModule(i, R._ring)
+ #- creating temp data structures
+ initBuchMoraCrit(self._strat)
+ self._strat.initEcart = initEcartBBA
+@@ -353,7 +353,7 @@ cdef class NCGroebnerStrategy(SageObject):
+ cdef ideal *i = sage_ideal_to_singular_ideal(L)
+ self._strat = new_skStrategy()
+
+- self._strat.ak = idRankFreeModule(i, R._ring)
++ self._strat.ak = id_RankFreeModule(i, R._ring)
+ #- creating temp data structures
+ initBuchMoraCrit(self._strat)
+ self._strat.initEcart = initEcartBBA
+diff --git a/src/sage/libs/singular/polynomial.pyx b/src/sage/libs/singular/polynomial.pyx
+index b40dc07..e243fae 100644
+--- a/src/sage/libs/singular/polynomial.pyx
++++ b/src/sage/libs/singular/polynomial.pyx
+@@ -22,8 +22,8 @@ plusminus_pattern = re.compile("([^\(^])([\+\-])")
+ from sage.libs.singular.decl cimport number, ideal
+ from sage.libs.singular.decl cimport currRing, rChangeCurrRing
+ from sage.libs.singular.decl cimport p_Copy, p_Add_q, p_Neg, pp_Mult_nn, p_GetCoeff, p_IsConstant, p_Cmp, pNext
+-from sage.libs.singular.decl cimport p_GetMaxExp, pp_Mult_qq, pPower, p_String, p_GetExp, pLDeg
+-from sage.libs.singular.decl cimport n_Delete, idInit, fast_map, id_Delete
++from sage.libs.singular.decl cimport p_GetMaxExp, pp_Mult_qq, pPower, p_String, p_GetExp, p_Deg, p_Totaldegree, p_WTotaldegree, p_WDegree
++from sage.libs.singular.decl cimport n_Delete, idInit, fast_map_common_subexp, id_Delete
+ from sage.libs.singular.decl cimport omAlloc0, omStrDup, omFree
+ from sage.libs.singular.decl cimport p_GetComp, p_SetComp
+ from sage.libs.singular.decl cimport pSubst
+@@ -198,7 +198,7 @@ cdef int singular_polynomial_call(poly **ret, poly *p, ring *r, list args, poly
+ from_id.m[0] = p
+
+ rChangeCurrRing(r)
+- cdef ideal *res_id = fast_map(from_id, r, to_id, r)
++ cdef ideal *res_id = fast_map_common_subexp(from_id, r, to_id, r)
+ ret[0] = res_id.m[0]
+
+ # Unsure why we have to normalize here. See #16958
+@@ -250,20 +250,19 @@ cdef int singular_polynomial_cmp(poly *p, poly *q, ring *r):
+ return 0
+ elif p_IsConstant(q,r):
+ # compare 0, const
+- return 1-2*r.cf.nGreaterZero(p_GetCoeff(q,r)) # -1: <, 1: > #
++ return 1-2*r.cf.cfGreaterZero(p_GetCoeff(q,r), r.cf) # -1: <, 1: > #
+ elif q == NULL:
+ if p_IsConstant(p,r):
+ # compare const, 0
+- return -1+2*r.cf.nGreaterZero(p_GetCoeff(p,r)) # -1: <, 1: >
+- #else
++ return -1+2*r.cf.cfGreaterZero(p_GetCoeff(p,r), r.cf) # -1: <, 1: >
+
+ while ret==0 and p!=NULL and q!=NULL:
+ ret = p_Cmp( p, q, r)
+
+ if ret==0:
+- h = r.cf.nSub(p_GetCoeff(p, r),p_GetCoeff(q, r))
++ h = r.cf.cfSub(p_GetCoeff(p, r),p_GetCoeff(q, r),r.cf)
+ # compare coeffs
+- ret = -1+r.cf.nIsZero(h)+2*r.cf.nGreaterZero(h) # -1: <, 0:==, 1: >
++ ret = -1+r.cf.cfIsZero(h,r.cf)+2*r.cf.cfGreaterZero(h, r.cf) # -1: <, 0:==, 1: >
+ n_Delete(&h, r)
+ p = pNext(p)
+ q = pNext(q)
+@@ -332,7 +331,7 @@ cdef int singular_polynomial_div_coeff(poly** ret, poly *p, poly *q, ring *r) ex
+ raise ZeroDivisionError
+ sig_on()
+ cdef number *n = p_GetCoeff(q, r)
+- n = r.cf.nInvers(n)
++ n = r.cf.cfInvers(n,r.cf)
+ ret[0] = pp_Mult_nn(p, n, r)
+ n_Delete(&n, r)
+ sig_off()
+@@ -524,14 +523,22 @@ cdef object singular_polynomial_str_with_changed_varnames(poly *p, ring *r, obje
+ return s
+
+ cdef long singular_polynomial_deg(poly *p, poly *x, ring *r):
+- cdef int deg, _deg, i
+-
+- deg = 0
++ cdef int i
++ cdef long _deg, deg
++
++ deg = -1
++ _deg = -1
+ if p == NULL:
+ return -1
+ if(r != currRing): rChangeCurrRing(r)
+ if x == NULL:
+- return pLDeg(p,°,r)
++ while p:
++ _deg = p_WTotaldegree(p,r)
++
++ if _deg > deg:
++ deg = _deg
++ p = pNext(p)
++ return deg
+
+ for i in range(1,r.N+1):
+ if p_GetExp(x, i, r):
+@@ -603,5 +610,3 @@ cdef int singular_polynomial_subst(poly **p, int var_index, poly *value, ring *r
+ p[0] = pSubst(p[0], var_index+1, value)
+ if unlikely(count >= 15 or exp > 15): sig_off()
+ return 0
+-
+-
+diff --git a/src/sage/libs/singular/ring.pyx b/src/sage/libs/singular/ring.pyx
+index 2feddbd..f7105af 100644
+--- a/src/sage/libs/singular/ring.pyx
++++ b/src/sage/libs/singular/ring.pyx
+@@ -18,11 +18,14 @@ from __future__ import print_function
+ from sage.libs.gmp.types cimport __mpz_struct
+ from sage.libs.gmp.mpz cimport mpz_init_set_ui, mpz_init_set
+
+-from sage.libs.singular.decl cimport number, lnumber, napoly, ring, currRing
+-from sage.libs.singular.decl cimport rChangeCurrRing, rCopy0, rComplete, rDelete
++from sage.libs.singular.decl cimport number, poly, ring, currRing
++from sage.libs.singular.decl cimport rChangeCurrRing, rCopy0, rComplete, rDelete, idInit
+ from sage.libs.singular.decl cimport omAlloc0, omStrDup, omAlloc, omAlloc0Bin, sip_sring_bin, rnumber_bin
+ from sage.libs.singular.decl cimport ringorder_dp, ringorder_Dp, ringorder_lp, ringorder_rp, ringorder_ds, ringorder_Ds, ringorder_ls, ringorder_M, ringorder_C, ringorder_wp, ringorder_Wp, ringorder_ws, ringorder_Ws, ringorder_a
+-from sage.libs.singular.decl cimport p_Copy
++from sage.libs.singular.decl cimport p_Copy, prCopyR
++from sage.libs.singular.decl cimport n_unknown, n_Zp, n_Q, n_R, n_GF, n_long_R, n_algExt,n_transExt,n_long_C, n_Z, n_Zn, n_Znm, n_Z2m, n_CF
++from sage.libs.singular.decl cimport n_coeffType, cfInitCharProc
++from sage.libs.singular.decl cimport rDefault, GFInfo, ZnmInfo, nInitChar, AlgExtInfo, nRegister, naInitChar
+
+ from sage.rings.integer cimport Integer
+ from sage.rings.integer_ring cimport IntegerRing_class
+@@ -109,30 +112,42 @@ cdef ring *singular_ring_new(base_ring, n, names, term_order) except NULL:
+ sage: P.<x,y,z> = Zmod(25213521351515232)[]; P
+ Multivariate Polynomial Ring in x, y, z over Ring of integers modulo 25213521351515232
+ """
++ cdef long cexponent
++ cdef GFInfo* _param
++ cdef ZnmInfo _info
+ cdef ring* _ring
+ cdef char **_names
++ cdef char **_ext_names
+ cdef char *_name
+ cdef int i,j
+ cdef int nblcks
+ cdef int offset
++ cdef int nvars
+ cdef int characteristic
+- cdef int ringtype = 0
++ cdef int modbase
++
++ cdef n_coeffType ringtype = n_unknown
+ cdef MPolynomialRing_libsingular k
+ cdef MPolynomial_libsingular minpoly
+- cdef lnumber *nmp
+- cdef int * m
++ cdef AlgExtInfo extParam
++ cdef n_coeffType _type = n_unknown
+
+- cdef __mpz_struct* ringflaga
+- cdef unsigned long ringflagb
++ #cdef cfInitCharProc myfunctionptr;
+
+- is_extension = False
++ _ring = NULL
+
+ n = int(n)
+ if n<1:
+ raise ArithmeticError("The number of variables must be at least 1.")
+
++ nvars = n
+ order = TermOrder(term_order, n)
+
++ cdef nbaseblcks = len(order.blocks())
++ nblcks = nbaseblcks + order.singular_moreblocks()
++ offset = 0
++
++
+ _names = <char**>omAlloc0(sizeof(char*)*(len(names)))
+ for i from 0 <= i < n:
+ _name = names[i]
+@@ -149,20 +164,110 @@ cdef ring *singular_ring_new(base_ring, n, names, term_order) except NULL:
+ ## p -p : Fp(a) *names FALSE (done)
+ ## q q : GF(q=p^n) *names TRUE (todo)
+
+- if base_ring.is_field() and base_ring.is_finite() and base_ring.is_prime_field():
++ _wvhdl = <int **>omAlloc0((nblcks + 2) * sizeof(int *))
++ _order = <int *>omAlloc0((nblcks + 2) * sizeof(int))
++ _block0 = <int *>omAlloc0((nblcks + 2) * sizeof(int))
++ _block1 = <int *>omAlloc0((nblcks + 2) * sizeof(int))
++
++
++
++ cdef int idx = 0
++ for i from 0 <= i < nbaseblcks:
++ s = order[i].singular_str()
++ if s[0] == 'M': # matrix order
++ _order[idx] = ringorder_M
++ mtx = order[i].matrix().list()
++ wv = <int *>omAlloc0(len(mtx)*sizeof(int))
++ for j in range(len(mtx)):
++ wv[j] = int(mtx[j])
++ _wvhdl[idx] = wv
++ elif s[0] == 'w' or s[0] == 'W': # weighted degree orders
++ _order[idx] = order_dict.get(s[:2], ringorder_dp)
++ wts = order[i].weights()
++ wv = <int *>omAlloc0(len(wts)*sizeof(int))
++ for j in range(len(wts)):
++ wv[j] = int(wts[j])
++ _wvhdl[idx] = wv
++ elif s[0] == '(' and order[i].name() == 'degneglex': # "(a(1:n),ls(n))"
++ _order[idx] = ringorder_a
++ if len(order[i]) == 0: # may be zero for arbitrary-length orders
++ nlen = n
++ else:
++ nlen = len(order[i])
++
++ _wvhdl[idx] = <int *>omAlloc0(len(order[i])*sizeof(int))
++ for j in range(nlen): _wvhdl[idx][j] = 1
++ _block0[idx] = offset + 1 # same like subsequent rp block
++ _block1[idx] = offset + nlen
++
++ idx += 1; # we need one more block here
++ _order[idx] = ringorder_rp
++
++ else: # ordinary orders
++ _order[idx] = order_dict.get(s, ringorder_dp)
++
++ _block0[idx] = offset + 1
++ if len(order[i]) == 0: # may be zero in some cases
++ _block1[idx] = offset + n
++ else:
++ _block1[idx] = offset + len(order[i])
++ offset = _block1[idx]
++ idx += 1
++
++ # TODO: if we construct a free module don't hardcode! This
++ # position determines whether we break ties at monomials first or
++ # whether we break at indices first!
++ _order[nblcks] = ringorder_C
++
++
++ if isinstance(base_ring, RationalField):
++ characteristic = 0
++ _ring = rDefault( characteristic ,nvars, _names, nblcks, _order, _block0, _block1, _wvhdl)
++
++ elif isinstance(base_ring, NumberField) and base_ring.is_absolute():
++ characteristic = 1
++ try:
++ k = PolynomialRing(RationalField(), 1, [base_ring.variable_name()], 'lex')
++ except TypeError:
++ raise TypeError, "The multivariate polynomial ring in a single variable %s in lex order over Rational Field is supposed to be of type %s"%(base_ring.variable_name(), MPolynomialRing_libsingular)
++
++ minpoly = base_ring.polynomial()(k.gen())
++
++ _ext_names = <char**>omAlloc0(sizeof(char*))
++ extname = k.gen()
++ _name = k._names[0]
++ _ext_names[0] = omStrDup(_name)
++ _cfr = rDefault( 0, 1, _ext_names )
++
++ _cfr.qideal = idInit(1,1)
++ rComplete(_cfr, 1)
++ _cfr.qideal.m[0] = prCopyR(minpoly._poly, k._ring, _cfr)
++ extParam.r = _cfr
++
++ # _type = nRegister(n_algExt, <cfInitCharProc> naInitChar);
++ _cf = nInitChar( n_algExt, <void *>&extParam) #
++
++ if (_cf is NULL):
++ raise RuntimeError, "Failed to allocate _cf ring."
++
++ _ring = rDefault (_cf ,nvars, _names, nblcks, _order, _block0, _block1, _wvhdl)
++
++ elif isinstance(base_ring, IntegerRing_class):
++ _cf = nInitChar( n_Z, NULL) # integer coefficient ring
++ _ring = rDefault (_cf ,nvars, _names, nblcks, _order, _block0, _block1, _wvhdl)
++
++ elif (isinstance(base_ring, FiniteField_generic) and base_ring.is_prime_field()):
++ #or (is_IntegerModRing(base_ring) and base_ring.characteristic().is_prime()):
++
+ if base_ring.characteristic() <= 2147483647:
+ characteristic = base_ring.characteristic()
+ else:
+ raise TypeError("Characteristic p must be <= 2147483647.")
+
+- elif isinstance(base_ring, RationalField):
+- characteristic = 0
++ # example for simpler ring creation interface without monomial orderings:
++ #_ring = rDefault(characteristic, nvars, _names)
+
+- elif isinstance(base_ring, IntegerRing_class):
+- ringflaga = <__mpz_struct*>omAlloc(sizeof(__mpz_struct))
+- mpz_init_set_ui(ringflaga, 0)
+- characteristic = 0
+- ringtype = 4 # integer ring
++ _ring = rDefault( characteristic , nvars, _names, nblcks, _order, _block0, _block1, _wvhdl)
+
+ elif isinstance(base_ring, FiniteField_generic):
+ if base_ring.characteristic() <= 2147483647:
+@@ -175,145 +280,90 @@ cdef ring *singular_ring_new(base_ring, n, names, term_order) except NULL:
+ except TypeError:
+ raise TypeError("The multivariate polynomial ring in a single variable %s in lex order over %s is supposed to be of type %s" % (base_ring.variable_name(), base_ring,MPolynomialRing_libsingular))
+ minpoly = base_ring.polynomial()(k.gen())
+- is_extension = True
+
+- elif isinstance(base_ring, NumberField) and base_ring.is_absolute():
+- characteristic = 1
+- try:
+- k = PolynomialRing(RationalField(), 1, [base_ring.variable_name()], 'lex')
+- except TypeError:
+- raise TypeError("The multivariate polynomial ring in a single variable %s in lex order over Rational Field is supposed to be of type %s" % (base_ring.variable_name(), MPolynomialRing_libsingular))
+- minpoly = base_ring.polynomial()(k.gen())
+- is_extension = True
++ ch = base_ring.characteristic()
++ F = ch.factor()
++ assert(len(F)==1)
++
++ modbase = F[0][0]
++ cexponent = F[0][1]
++
++ _ext_names = <char**>omAlloc0(sizeof(char*))
++ _name = k._names[0]
++ _ext_names[0] = omStrDup(_name)
++ _cfr = rDefault( modbase, 1, _ext_names )
++
++ _cfr.qideal = idInit(1,1)
++ rComplete(_cfr, 1)
++ _cfr.qideal.m[0] = prCopyR(minpoly._poly, k._ring, _cfr)
++ extParam.r = _cfr
++ _cf = nInitChar( n_algExt, <void *>&extParam)
++
++ if (_cf is NULL):
++ raise RuntimeError, "Failed to allocate _cf ring."
++
++ _ring = rDefault (_cf ,nvars, _names, nblcks, _order, _block0, _block1, _wvhdl)
+
+ elif is_IntegerModRing(base_ring):
++
+ ch = base_ring.characteristic()
+- if ch.is_power_of(2):
++ isprime = ch.is_prime()
++
++ if not isprime and ch.is_power_of(2):
+ exponent = ch.nbits() -1
+- # it seems Singular uses ints somewhere
+- # internally, cf. #6051 (Sage) and #138 (Singular)
+- if exponent <= 30:
+- ringtype = 1
+- else:
+- ringtype = 3
+- characteristic = exponent
+- ringflaga = <__mpz_struct*>omAlloc(sizeof(__mpz_struct))
+- mpz_init_set_ui(ringflaga, 2)
+- ringflagb = exponent
++ cexponent = exponent
++
++ if exponent <= 30: ringtype = n_Z2m
++ else: ringtype = n_Znm
++
++ if ringtype == n_Znm:
++
++ F = ch.factor()
++
++ modbase = F[0][0]
++ cexponent = F[0][1]
++
++ _info.base = <__mpz_struct*>omAlloc(sizeof(__mpz_struct))
++ mpz_init_set_ui(_info.base, modbase)
++ _info.exp = cexponent
++ _cf = nInitChar( n_Znm, <void *>&_info )
++
++ elif ringtype == n_Z2m:
++ _cf = nInitChar( n_Z2m, <void *>cexponent )
++
+
+- elif base_ring.characteristic().is_prime_power() and ch < ZZ(2)**160:
++ elif not isprime and ch.is_prime_power() and ch < ZZ(2)**160:
+ F = ch.factor()
+ assert(len(F)==1)
+
+- ringtype = 3
+- ringflaga = <__mpz_struct*>omAlloc(sizeof(__mpz_struct))
+- mpz_init_set(ringflaga, (<Integer>F[0][0]).value)
+- ringflagb = F[0][1]
+- characteristic = F[0][1]
++ modbase = F[0][0]
++ cexponent = F[0][1]
++
++ _info.base = <__mpz_struct*>omAlloc(sizeof(__mpz_struct))
++ mpz_init_set_ui(_info.base, modbase)
++ _info.exp = cexponent
++ _cf = nInitChar( n_Znm, <void *>&_info )
+
+ else:
+- # normal modulus
+ try:
+ characteristic = ch
+ except OverflowError:
+ raise NotImplementedError("Characteristic %d too big." % ch)
+- ringtype = 2
+- ringflaga = <__mpz_struct*>omAlloc(sizeof(__mpz_struct))
+- mpz_init_set_ui(ringflaga, characteristic)
+- ringflagb = 1
+- else:
+- raise NotImplementedError("Base ring is not supported.")
+
+- _ring = <ring*>omAlloc0Bin(sip_sring_bin)
+- if (_ring is NULL):
+- raise ValueError("Failed to allocate Singular ring.")
+- _ring.ch = characteristic
+- _ring.ringtype = ringtype
+- _ring.N = n
+- _ring.names = _names
+-
+- if is_extension:
+- rChangeCurrRing(k._ring)
+- _ring.algring = rCopy0(k._ring)
+- rComplete(_ring.algring, 1)
+- _ring.algring.pCompIndex = -1
+- _ring.P = _ring.algring.N
+- _ring.parameter = <char**>omAlloc0(sizeof(char*)*2)
+- _ring.parameter[0] = omStrDup(_ring.algring.names[0])
+-
+- nmp = <lnumber*>omAlloc0Bin(rnumber_bin)
+- nmp.z= <napoly*>p_Copy(minpoly._poly, _ring.algring) # fragile?
+- nmp.s=2
+-
+- _ring.minpoly=<number*>nmp
+-
+- cdef nbaseblcks = len(order.blocks())
+- nblcks = nbaseblcks + order.singular_moreblocks()
+- offset = 0
++ _info.base = <__mpz_struct*>omAlloc(sizeof(__mpz_struct))
++ mpz_init_set_ui(_info.base, characteristic)
++ _info.exp = 1
++ _cf = nInitChar( n_Zn, <void *>&_info )
++ _ring = rDefault( _cf ,nvars, _names, nblcks, _order, _block0, _block1, _wvhdl)
+
+- _ring.wvhdl = <int **>omAlloc0((nblcks + 2) * sizeof(int *))
+- _ring.order = <int *>omAlloc0((nblcks + 2) * sizeof(int))
+- _ring.block0 = <int *>omAlloc0((nblcks + 2) * sizeof(int))
+- _ring.block1 = <int *>omAlloc0((nblcks + 2) * sizeof(int))
+
+- if order.is_local():
+- _ring.OrdSgn = -1
+ else:
+- _ring.OrdSgn = 1
+-
+- cdef int idx = 0
+- for i from 0 <= i < nbaseblcks:
+- s = order[i].singular_str()
+- if s[0] == 'M': # matrix order
+- _ring.order[idx] = ringorder_M
+- mtx = order[i].matrix().list()
+- wv = <int *>omAlloc0(len(mtx)*sizeof(int))
+- for j in range(len(mtx)):
+- wv[j] = int(mtx[j])
+- _ring.wvhdl[idx] = wv
+- elif s[0] == 'w' or s[0] == 'W': # weighted degree orders
+- _ring.order[idx] = order_dict.get(s[:2], ringorder_dp)
+- wts = order[i].weights()
+- wv = <int *>omAlloc0(len(wts)*sizeof(int))
+- for j in range(len(wts)):
+- wv[j] = int(wts[j])
+- _ring.wvhdl[idx] = wv
+- elif s[0] == '(' and order[i].name() == 'degneglex': # "(a(1:n),ls(n))"
+- _ring.order[idx] = ringorder_a
+- if len(order[i]) == 0: # may be zero for arbitrary-length orders
+- nlen = n
+- else:
+- nlen = len(order[i])
+-
+- _ring.wvhdl[idx] = <int *>omAlloc0(len(order[i])*sizeof(int))
+- for j in range(nlen): _ring.wvhdl[idx][j] = 1
+- _ring.block0[idx] = offset + 1 # same like subsequent rp block
+- _ring.block1[idx] = offset + nlen
+-
+- idx += 1; # we need one more block here
+- _ring.order[idx] = ringorder_rp
+-
+- else: # ordinary orders
+- _ring.order[idx] = order_dict.get(s, ringorder_dp)
++ raise NotImplementedError("Base ring is not supported.")
+
+- _ring.block0[idx] = offset + 1
+- if len(order[i]) == 0: # may be zero in some cases
+- _ring.block1[idx] = offset + n
+- else:
+- _ring.block1[idx] = offset + len(order[i])
+- offset = _ring.block1[idx]
+- idx += 1
+
+- # TODO: if we construct a free module don't hardcode! This
+- # position determines whether we break ties at monomials first or
+- # whether we break at indices first!
+- _ring.order[nblcks] = ringorder_C
+-
+- if ringtype != 0:
+- _ring.ringflaga = ringflaga
+- _ring.ringflagb = ringflagb
++ if (_ring is NULL):
++ raise ValueError("Failed to allocate Singular ring.")
+
+- rComplete(_ring, 1)
+ _ring.ShortOut = 0
+
+ rChangeCurrRing(_ring)
+@@ -322,6 +372,16 @@ cdef ring *singular_ring_new(base_ring, n, names, term_order) except NULL:
+ if wrapped_ring in ring_refcount_dict:
+ raise ValueError('newly created ring already in dictionary??')
+ ring_refcount_dict[wrapped_ring] = 1
++
++ rComplete(_ring, 1)
++
++ _ring.ShortOut = 0
++
++ if order.is_local():
++ assert(_ring.OrdSgn == -1)
++ if order.is_global():
++ assert(_ring.OrdSgn == 1)
++
+ return _ring
+
+
+diff --git a/src/sage/libs/singular/singular.pxd b/src/sage/libs/singular/singular.pxd
+index b02b53a..e06566e 100644
+--- a/src/sage/libs/singular/singular.pxd
++++ b/src/sage/libs/singular/singular.pxd
+@@ -17,7 +17,7 @@ from sage.rings.number_field.number_field_base cimport NumberField
+ # Conversion from Singular to Sage types
+ # ======================================
+
+-cdef Rational si2sa_QQ(number (*),ring (*))
++cdef Rational si2sa_QQ(number (*), number **, ring (*))
+ cdef Integer si2sa_ZZ(number (*),ring (*))
+
+ cdef FFgivE si2sa_GFqGivaro(number *n, ring *_ring, Cache_givaro cache)
+@@ -53,9 +53,6 @@ cdef number *sa2si(Element elem, ring * _ring)
+ # Initialisation
+ # ==============
+
+-cdef int overflow_check(long e, ring *_ring) except -1
++cdef int overflow_check(unsigned long e, ring *_ring) except -1
+
+ cdef init_libsingular()
+-
+-
+-
+diff --git a/src/sage/libs/singular/singular.pyx b/src/sage/libs/singular/singular.pyx
+index 7245090..7495325 100644
+--- a/src/sage/libs/singular/singular.pyx
++++ b/src/sage/libs/singular/singular.pyx
+@@ -5,12 +5,14 @@ AUTHOR:
+
+ - Martin Albrecht <malb at informatik.uni-bremen.de>
+ """
+-###############################################################################
++
++#*****************************************************************************
+ # Copyright (C) 2005, 2006 William Stein <wstein at gmail.com>
+ #
+-# Distributed under the terms of the GNU General Public License (GPL)
+-# as published by the Free Software Foundation; either version 2 of
+-# the License, or (at your option) any later version.
++# This program is free software: you can redistribute it and/or modify
++# it under the terms of the GNU General Public License as published by
++# the Free Software Foundation, either version 2 of the License, or
++# (at your option) any later version.
+ # http://www.gnu.org/licenses/
+ ###############################################################################
+ from __future__ import print_function
+@@ -24,19 +26,7 @@ cdef extern from "limits.h":
+ import os
+
+ from libc.stdint cimport int64_t
+-from sage.libs.singular.decl cimport intvec
+-from sage.libs.singular.decl cimport SR_HDL, SR_INT, SR_TO_INT
+-from sage.libs.singular.decl cimport singular_options, singular_verbose_options
+-from sage.libs.singular.decl cimport On, Off, SW_USE_NTL, SW_USE_NTL_GCD_0, SW_USE_EZGCD, SW_USE_NTL_SORT, SW_USE_NTL_GCD_P
+-from sage.libs.singular.decl cimport napoly, lnumber, Sy_bit, OPT_REDSB, OPT_INTSTRATEGY, OPT_REDTAIL, OPT_REDTHROUGH
+-from sage.libs.singular.decl cimport nlGetNumerator, nlGetDenom, nlDelete, nlInit2gmp
+-from sage.libs.singular.decl cimport naIsOne, naIsOne, naIsZero, naPar, naInit, naAdd, naMult, naDelete, naMap00
+-from sage.libs.singular.decl cimport napGetCoeff, napGetExpFrom, pNext
+-from sage.libs.singular.decl cimport nrzInit, nr2mMapZp, nrnMapGMP
+-from sage.libs.singular.decl cimport siInit
+-from sage.libs.singular.decl cimport n_Init
+-from sage.libs.singular.decl cimport rChangeCurrRing, currRing
+-from sage.libs.singular.decl cimport WerrorS_callback, const_char_ptr
++from sage.libs.singular.decl cimport *
+
+ from sage.rings.rational_field import RationalField
+ from sage.rings.integer_ring cimport IntegerRing_class
+@@ -52,7 +42,7 @@ from sage.rings.polynomial.multi_polynomial_libsingular cimport MPolynomial_libs
+
+ _saved_options = (int(0),0,0)
+
+-cdef Rational si2sa_QQ(number *n, ring *_ring):
++cdef Rational si2sa_QQ(number *n, number **nn, ring *_ring):
+ """
+ TESTS::
+
+@@ -83,26 +73,27 @@ cdef Rational si2sa_QQ(number *n, ring *_ring):
+ ## structures aligned on 4 byte boundaries and therefor have last bit zero.
+ ## (The second bit is reserved as tag to allow extensions of this scheme.)
+ ## Using immediates as pointers and dereferencing them gives address errors.
+- nom = nlGetNumerator(n, _ring)
++ nom = nlGetNumerator(n, _ring.cf)
+ mpz_init(nom_z)
+
+ if (SR_HDL(nom) & SR_INT): mpz_set_si(nom_z, SR_TO_INT(nom))
+ else: mpz_set(nom_z,nom.z)
+
+ mpq_set_num(_z,nom_z)
+- nlDelete(&nom,_ring)
++ nlDelete(&nom,_ring.cf)
+ mpz_clear(nom_z)
+
+- denom = nlGetDenom(n, _ring)
++ denom = nlGetDenom(n, _ring.cf)
+ mpz_init(denom_z)
+
+ if (SR_HDL(denom) & SR_INT): mpz_set_si(denom_z, SR_TO_INT(denom))
+ else: mpz_set(denom_z,denom.z)
+
+ mpq_set_den(_z, denom_z)
+- nlDelete(&denom,_ring)
++ nlDelete(&denom,_ring.cf)
+ mpz_clear(denom_z)
+
++ nn[0] = n
+ z = Rational()
+ z.set_from_mpq(_z)
+ mpq_clear(_z)
+@@ -140,31 +131,33 @@ cdef FFgivE si2sa_GFqGivaro(number *n, ring *_ring, Cache_givaro cache):
+ sage: K(R(0))
+ 0
+ """
+- cdef napoly *z
++ cdef poly *z
+ cdef int c, e
+ cdef int a
+ cdef int ret
+ cdef int order
++ cdef ring *cfRing = _ring.cf.extRing
+
+- if naIsZero(n):
++ if _ring.cf.cfIsZero(n,_ring.cf):
+ return cache._zero_element
+- elif naIsOne(n):
++ elif _ring.cf.cfIsOne(n,_ring.cf):
+ return cache._one_element
+- z = (<lnumber*>n).z
++
++ z = <poly*>n
+
+ a = cache.objectptr.indeterminate()
+ ret = cache.objectptr.zero
+ order = cache.objectptr.cardinality() - 1
+
+ while z:
+- c = cache.objectptr.initi(c, <int64_t>napGetCoeff(z))
+- e = napGetExpFrom(z,1, _ring)
++ c = cache.objectptr.initi(c, <int64_t>p_GetCoeff(z, cfRing))
++ e = p_GetExp(z, 1, cfRing)
+ if e == 0:
+ ret = cache.objectptr.add(ret, c, ret)
+ else:
+ a = ( e * cache.objectptr.indeterminate() ) % order
+ ret = cache.objectptr.axpy(ret, c, a, ret)
+- z = <napoly*>pNext(<poly*>z)
++ z = <poly*>pNext(<poly*>z)
+ return (<FFgivE>cache._zero_element)._new_c(ret)
+
+ cdef FFgf2eE si2sa_GFqNTLGF2E(number *n, ring *_ring, Cache_ntl_gf2e cache):
+@@ -179,26 +172,27 @@ cdef FFgf2eE si2sa_GFqNTLGF2E(number *n, ring *_ring, Cache_ntl_gf2e cache):
+ sage: type(f.lc())
+ <type 'sage.rings.finite_rings.element_ntl_gf2e.FiniteField_ntl_gf2eElement'>
+ """
+- cdef napoly *z
++ cdef poly *z
+ cdef long c
+ cdef int e
+ cdef FFgf2eE a
+ cdef FFgf2eE ret
++ cdef ring *cfRing = _ring.cf.extRing
+
+- if naIsZero(n):
++ if _ring.cf.cfIsZero(n,_ring.cf):
+ return cache._zero_element
+- elif naIsOne(n):
++ elif _ring.cf.cfIsOne(n,_ring.cf):
+ return cache._one_element
+- z = (<lnumber*>n).z
+
++ z = <poly*>n
+ a = cache._gen
+ ret = cache._zero_element
+
+ while z:
+- c = <long>napGetCoeff(z)
+- e = napGetExpFrom(z,1, _ring)
++ c = <long>p_GetCoeff(z, cfRing)
++ e = p_GetExp(z, 1, cfRing)
+ ret += c * a**e
+- z = <napoly*>pNext(<poly*>z)
++ z = <poly*>pNext(<poly*>z)
+ return ret
+
+ cdef object si2sa_GFq_generic(number *n, ring *_ring, object base):
+@@ -222,29 +216,31 @@ cdef object si2sa_GFq_generic(number *n, ring *_ring, object base):
+ 2147483646
+
+ """
+- cdef napoly *z
++ cdef poly *z
+ cdef long c
+ cdef int e
+ cdef object a
+ cdef object ret
++ cdef ring *cfRing = _ring.cf.extRing
+
+- if naIsZero(n):
++ if _ring.cf.cfIsZero(n,_ring.cf):
+ return base.zero()
+- elif naIsOne(n):
++ elif _ring.cf.cfIsOne(n,_ring.cf):
+ return base.one()
+- z = (<lnumber*>n).z
++
++ z = <poly*>n
+
+ a = base.gen()
+ ret = base.zero()
+
+ while z:
+- c = <long>napGetCoeff(z)
+- e = napGetExpFrom(z,1, _ring)
++ c = <long>p_GetCoeff(z, cfRing)
++ e = p_GetExp(z, 1, cfRing)
+ if e == 0:
+ ret = ret + c
+ elif c != 0:
+ ret = ret + c * a**e
+- z = <napoly*>pNext(<poly*>z)
++ z = <poly*>pNext(<poly*>z)
+ return ret
+
+ cdef object si2sa_NF(number *n, ring *_ring, object base):
+@@ -259,30 +255,40 @@ cdef object si2sa_NF(number *n, ring *_ring, object base):
+ sage: type(f.lc())
+ <type 'sage.rings.number_field.number_field_element_quadratic.NumberFieldElement_quadratic'>
+ """
+- cdef napoly *z
++ cdef poly *z
+ cdef number *c
+ cdef int e
+ cdef object a
+ cdef object ret
++ cdef ring *cfRing = _ring.cf.extRing
+
+- if naIsZero(n):
++ if _ring.cf.cfIsZero(n,_ring.cf):
+ return base._zero_element
+- elif naIsOne(n):
++ elif _ring.cf.cfIsOne(n,_ring.cf):
+ return base._one_element
+- z = (<lnumber*>n).z
++
++ z = <poly*>n
+
+ a = base.gen()
+ ret = base(0)
+
+ while z:
+- c = napGetCoeff(z)
+- coeff = si2sa_QQ(c, _ring)
+- e = napGetExpFrom(z,1, _ring)
++ # p_GetCoeff returns a reference
++ c = p_GetCoeff(z, cfRing)
++ # si2sa_QQ might modify c
++ coeff = si2sa_QQ(c, &c, cfRing)
++ # so we force it back.
++ z.coef = c
++ #pSetCoeff0(z,c)
++ #p_SetCoeff(z, c, cfRing)
++ # rather than trying to let Cython and C++ automagically modify it
++ #coeff = si2sa_QQ(p_GetCoeff(z, cfRing), cfRing)
++ e = p_GetExp(z, 1, cfRing)
+ if e == 0:
+ ret = ret + coeff
+ elif coeff != 0:
+ ret = ret + coeff * a**e
+- z = <napoly*>pNext(<poly*>z)
++ z = <poly*>pNext(<poly*>z)
+ return base(ret)
+
+ cdef inline object si2sa_ZZmod(number *n, ring *_ring, object base):
+@@ -322,13 +328,15 @@ cdef inline object si2sa_ZZmod(number *n, ring *_ring, object base):
+ 3
+ """
+ cdef Integer ret
+- if _ring.ringtype == 1:
++ if _ring.cf.type == n_Z2m:
+ return base(<long>n)
+- else:
++ elif _ring.cf.type == n_Znm or _ring.cf.type == n_Zn:
+ ret = Integer()
+ ret.set_from_mpz(<mpz_ptr>n)
+ return base(ret)
+
++ return base(_ring.cf.cfInt(n,_ring.cf))
++
+ cdef number *sa2si_QQ(Rational r, ring *_ring):
+ """
+ TESTS::
+@@ -344,44 +352,39 @@ cdef number *sa2si_QQ(Rational r, ring *_ring):
+ 12345678901234567890/23
+ """
+ if _ring != currRing: rChangeCurrRing(_ring)
+- return nlInit2gmp( mpq_numref(r.value), mpq_denref(r.value) )
++ return nlInit2gmp( mpq_numref(r.value), mpq_denref(r.value),_ring.cf )
+
+ cdef number *sa2si_GFqGivaro(int quo, ring *_ring):
+ """
+ """
+ if _ring != currRing: rChangeCurrRing(_ring)
+- cdef number *n1
+- cdef number *n2
+- cdef number *a
+- cdef number *coeff
+- cdef number *apow1
+- cdef number *apow2
+- cdef int b = - _ring.ch
++ cdef number *n1, *n2, *a, *coeff, *apow1, *apow2
++ cdef int b = _ring.cf.ch
+
+- a = naPar(1)
++ a = _ring.cf.cfParameter(1, _ring.cf)
+
+- apow1 = naInit(1, _ring)
+- n1 = naInit(0, _ring)
++ apow1 = _ring.cf.cfInit(1, _ring.cf)
++ n1 = _ring.cf.cfInit(0, _ring.cf)
+
+ while quo!=0:
+- coeff = naInit(quo%b, _ring)
++ coeff = _ring.cf.cfInit(quo%b, _ring.cf)
+
+- if not naIsZero(coeff):
+- apow2 = naMult(coeff, apow1)
+- n2 = naAdd(apow2, n1)
+- naDelete(&apow2, _ring)
+- naDelete(&n1, _ring)
++ if not _ring.cf.cfIsZero(coeff, _ring.cf):
++ apow2 = _ring.cf.cfMult(coeff, apow1, _ring.cf)
++ n2 = _ring.cf.cfAdd(apow2, n1, _ring.cf)
++ _ring.cf.cfDelete(&apow2, _ring.cf)
++ _ring.cf.cfDelete(&n1, _ring.cf)
+ n1 = n2
+
+- apow2 = naMult(apow1, a)
+- naDelete(&apow1, _ring)
++ apow2 = _ring.cf.cfMult(apow1, a, _ring.cf)
++ _ring.cf.cfDelete(&apow1, _ring.cf)
+ apow1 = apow2
+
+ quo = quo/b
+- naDelete(&coeff, _ring)
++ _ring.cf.cfDelete(&coeff, _ring.cf)
+
+- naDelete(&apow1, _ring)
+- naDelete(&a, _ring)
++ _ring.cf.cfDelete(&apow1, _ring.cf)
++ _ring.cf.cfDelete(&a, _ring.cf)
+ return n1
+
+ cdef number *sa2si_GFqNTLGF2E(FFgf2eE elem, ring *_ring):
+@@ -398,30 +401,30 @@ cdef number *sa2si_GFqNTLGF2E(FFgf2eE elem, ring *_ring):
+ cdef GF2X_c rep = GF2E_rep(elem.x)
+
+ if GF2X_deg(rep) >= 1:
+- n1 = naInit(0, _ring)
+- a = naPar(1)
+- apow1 = naInit(1, _ring)
++ n1 = _ring.cf.cfInit(0, _ring.cf)
++ a = _ring.cf.cfParameter(1,_ring.cf)
++ apow1 = _ring.cf.cfInit(1, _ring.cf)
+
+ for i from 0 <= i <= GF2X_deg(rep):
+- coeff = naInit(GF2_conv_to_long(GF2X_coeff(rep,i)), _ring)
++ coeff = _ring.cf.cfInit(GF2_conv_to_long(GF2X_coeff(rep,i)), _ring.cf)
+
+- if not naIsZero(coeff):
+- apow2 = naMult(coeff, apow1)
+- n2 = naAdd(apow2, n1)
+- naDelete(&apow2, _ring)
+- naDelete(&n1, _ring);
++ if not _ring.cf.cfIsZero(coeff,_ring.cf):
++ apow2 = _ring.cf.cfMult(coeff, apow1,_ring.cf)
++ n2 = _ring.cf.cfAdd(apow2, n1,_ring.cf)
++ _ring.cf.cfDelete(&apow2, _ring.cf)
++ _ring.cf.cfDelete(&n1, _ring.cf);
+ n1 = n2
+
+- apow2 = naMult(apow1, a)
+- naDelete(&apow1, _ring)
++ apow2 = _ring.cf.cfMult(apow1, a,_ring.cf)
++ _ring.cf.cfDelete(&apow1, _ring.cf)
+ apow1 = apow2
+
+- naDelete(&coeff, _ring)
++ _ring.cf.cfDelete(&coeff, _ring.cf)
+
+- naDelete(&apow1, _ring)
+- naDelete(&a, _ring)
++ _ring.cf.cfDelete(&apow1, _ring.cf)
++ _ring.cf.cfDelete(&a, _ring.cf)
+ else:
+- n1 = naInit(GF2_conv_to_long(GF2X_coeff(rep,0)), _ring)
++ n1 = _ring.cf.cfInit(GF2_conv_to_long(GF2X_coeff(rep,0)), _ring.cf)
+
+ return n1
+
+@@ -439,30 +442,30 @@ cdef number *sa2si_GFq_generic(object elem, ring *_ring):
+
+ if _ring != currRing: rChangeCurrRing(_ring)
+ if elem.degree() > 0:
+- n1 = naInit(0, _ring)
+- a = naPar(1)
+- apow1 = naInit(1, _ring)
++ n1 = _ring.cf.cfInit(0, _ring.cf)
++ a = _ring.cf.cfParameter(1,_ring.cf)
++ apow1 = _ring.cf.cfInit(1, _ring.cf)
+
+ for i from 0 <= i <= elem.degree():
+- coeff = naInit(int(elem[i]), _ring)
++ coeff = _ring.cf.cfInit(int(elem[i]), _ring.cf)
+
+- if not naIsZero(coeff):
+- apow2 = naMult(coeff, apow1)
+- n2 = naAdd(apow2, n1)
+- naDelete(&apow2, _ring)
+- naDelete(&n1, _ring);
++ if not _ring.cf.cfIsZero(coeff,_ring.cf):
++ apow2 = _ring.cf.cfMult(coeff, apow1,_ring.cf)
++ n2 = _ring.cf.cfAdd(apow2, n1,_ring.cf)
++ _ring.cf.cfDelete(&apow2, _ring.cf)
++ _ring.cf.cfDelete(&n1, _ring.cf);
+ n1 = n2
+
+- apow2 = naMult(apow1, a)
+- naDelete(&apow1, _ring)
++ apow2 = _ring.cf.cfMult(apow1, a,_ring.cf)
++ _ring.cf.cfDelete(&apow1, _ring.cf)
+ apow1 = apow2
+
+- naDelete(&coeff, _ring)
++ _ring.cf.cfDelete(&coeff, _ring.cf)
+
+- naDelete(&apow1, _ring)
+- naDelete(&a, _ring)
++ _ring.cf.cfDelete(&apow1, _ring.cf)
++ _ring.cf.cfDelete(&a, _ring.cf)
+ else:
+- n1 = naInit(int(elem), _ring)
++ n1 = _ring.cf.cfInit(int(elem), _ring.cf)
+
+ return n1
+
+@@ -477,32 +480,58 @@ cdef number *sa2si_NF(object elem, ring *_ring):
+ cdef number *naCoeff
+ cdef number *apow1
+ cdef number *apow2
++
++ cdef nMapFunc nMapFuncPtr = NULL;
++
++ nMapFuncPtr = naSetMap(_ring.cf, currRing.cf) # choose correct mapping function
++
++ if (nMapFuncPtr is NULL):
++ raise RuntimeError, "Failed to determine nMapFuncPtr"
++
+ elem = list(elem)
+
+ if _ring != currRing: rChangeCurrRing(_ring)
+- n1 = naInit(0, _ring)
+- a = naPar(1)
+- apow1 = naInit(1, _ring)
+-
++ n1 = _ring.cf.cfInit(0, _ring.cf)
++ a = _ring.cf.cfParameter(1,_ring.cf)
++ apow1 = _ring.cf.cfInit(1, _ring.cf)
++
++ cdef char *_name
++
++ # the result of nlInit2gmp() is in a plain polynomial ring over QQ (not an extension ring!),
++ # so we hace to get/create one :
++ #
++ # todo: reuse qqr/ get an existing Singular polynomial ring over Q.
++ varname = "a"
++ _name = omStrDup(varname)
++ cdef char **_ext_names
++ _ext_names = <char**>omAlloc0(sizeof(char*))
++ _ext_names[0] = omStrDup(_name)
++ qqr = rDefault( 0, 1, _ext_names);
++ rComplete(qqr,1)
++ qqr.ShortOut = 0
++
++
++ nMapFuncPtr = naSetMap( qqr.cf , _ring.cf ) # choose correct mapping function
++ cdef poly *_p
+ for i from 0 <= i < len(elem):
+- nlCoeff = nlInit2gmp( mpq_numref((<Rational>elem[i]).value), mpq_denref((<Rational>elem[i]).value) )
+- naCoeff = naMap00(nlCoeff)
+- nlDelete(&nlCoeff, _ring)
++ nlCoeff = nlInit2gmp( mpq_numref((<Rational>elem[i]).value), mpq_denref((<Rational>elem[i]).value), qqr.cf )
++ naCoeff = nMapFuncPtr(nlCoeff, qqr.cf , _ring.cf )
++ nlDelete(&nlCoeff, _ring.cf)
+
+ # faster would be to assign the coefficient directly
+- apow2 = naMult(naCoeff, apow1)
+- n2 = naAdd(apow2, n1)
+- naDelete(&apow2, _ring)
+- naDelete(&n1, _ring);
+- naDelete(&naCoeff, _ring)
++ apow2 = _ring.cf.cfMult(naCoeff, apow1,_ring.cf)
++ n2 = _ring.cf.cfAdd(apow2, n1,_ring.cf)
++ _ring.cf.cfDelete(&apow2, _ring.cf)
++ _ring.cf.cfDelete(&n1, _ring.cf);
++ _ring.cf.cfDelete(&naCoeff, _ring.cf)
+ n1 = n2
+
+- apow2 = naMult(apow1, a)
+- naDelete(&apow1, _ring)
++ apow2 = _ring.cf.cfMult(apow1, a,_ring.cf)
++ _ring.cf.cfDelete(&apow1, _ring.cf)
+ apow1 = apow2
+
+- naDelete(&apow1, _ring)
+- naDelete(&a, _ring)
++ _ring.cf.cfDelete(&apow1, _ring.cf)
++ _ring.cf.cfDelete(&a, _ring.cf)
+
+ return n1
+
+@@ -521,7 +550,7 @@ cdef number *sa2si_ZZ(Integer d, ring *_ring):
+ 12345678901234567890
+ """
+ if _ring != currRing: rChangeCurrRing(_ring)
+- cdef number *n = nrzInit(0, _ring)
++ cdef number *n = nrzInit(0, _ring.cf)
+ mpz_set(<mpz_ptr>n, d.value)
+ return <number*>n
+
+@@ -563,20 +592,49 @@ cdef inline number *sa2si_ZZmod(IntegerMod_abstract d, ring *_ring):
+ """
+ nr2mModul = d.parent().characteristic()
+ if _ring != currRing: rChangeCurrRing(_ring)
+- cdef int _d
+- if _ring.ringtype == 1:
++
++ cdef number *nn
++
++ cdef int64_t _d
++ cdef char *_name
++ cdef char **_ext_names
++ varname = "a"
++
++ cdef nMapFunc nMapFuncPtr = NULL;
++
++ if _ring.cf.type == n_Z2m:
+ _d = long(d)
+- return nr2mMapZp(<number *>_d)
+- else:
++ return nr2mMapZp(<number *>_d, currRing.cf, _ring.cf)
++ elif _ring.cf.type == n_Zn or _ring.cf.type == n_Znm:
+ lift = d.lift()
+- return nrnMapGMP(<number *>((<Integer>lift).value))
++
++ # if I understand nrnMapGMP/nMapFuncPtr correctly we need first
++ # a source value in ZZr
++ # create ZZr, a plain polynomial ring over ZZ with one variable.
++ #
++ # todo (later): reuse ZZr
++ _name = omStrDup(varname)
++ _ext_names = <char**>omAlloc0(sizeof(char*))
++ _ext_names[0] = omStrDup(_name)
++ _cf = nInitChar( n_Z, NULL) # integer coefficient ring
++ ZZr = rDefault (_cf ,1, _ext_names)
++ rComplete(ZZr,1)
++ ZZr.ShortOut = 0
++
++ nn = nrzInit(0, ZZr.cf)
++ mpz_set(<mpz_ptr>nn, (<Integer>lift).value)
++ nMapFuncPtr = nrnSetMap( ZZr.cf, _ring.cf)
++
++ return nMapFuncPtr(nn, ZZr.cf, _ring.cf)
++ else:
++ raise ValueError
+
+ cdef object si2sa(number *n, ring *_ring, object base):
+ if isinstance(base, FiniteField_prime_modn):
+- return base(_ring.cf.n_Int(n, _ring))
++ return base(_ring.cf.cfInt(n, _ring.cf))
+
+ elif isinstance(base, RationalField):
+- return si2sa_QQ(n,_ring)
++ return si2sa_QQ(n,&n,_ring)
+
+ elif isinstance(base, IntegerRing_class):
+ return si2sa_ZZ(n,_ring)
+@@ -594,8 +652,8 @@ cdef object si2sa(number *n, ring *_ring, object base):
+ return si2sa_NF(n, _ring, base)
+
+ elif isinstance(base, IntegerModRing_generic):
+- if _ring.ringtype == 0:
+- return base(_ring.cf.n_Int(n, _ring))
++ if _ring.cf.type == n_unknown:
++ return base(_ring.cf.cfInt(n, _ring.cf))
+ return si2sa_ZZmod(n, _ring, base)
+
+ else:
+@@ -624,7 +682,7 @@ cdef number *sa2si(Element elem, ring * _ring):
+ elif isinstance(elem._parent, NumberField) and elem._parent.is_absolute():
+ return sa2si_NF(elem, _ring)
+ elif isinstance(elem._parent, IntegerModRing_generic):
+- if _ring.ringtype == 0:
++ if _ring.cf.type == n_unknown:
+ return n_Init(int(elem),_ring)
+ return sa2si_ZZmod(elem, _ring)
+ else:
+@@ -654,45 +712,36 @@ cdef extern from "dlfcn.h":
+ cdef long RTLD_LAZY
+ cdef long RTLD_GLOBAL
+
+-cdef int overflow_check(long e, ring *_ring) except -1:
++cdef int overflow_check(unsigned long e, ring *_ring) except -1:
+ """
+- Raises an ``OverflowError`` if e is > max degree per variable,
+- or if it is not acceptable for Singular as exponent of the
+- given ring.
++ Raise an ``OverflowError`` if e is > max degree per variable.
+
+ INPUT:
+
+- - ``e`` - some integer representing a degree.
+- - ``_ring`` - a pointer to some ring.
++ - ``e`` -- some integer representing a degree.
+
+- TESTS:
++ - ``_ring`` -- a pointer to some ring.
+
+- Whether an overflow occurs or not, partially depends
+- on the number of variables in the ring. See :trac:`11856`::
++ Whether an overflow occurs or not partially depends
++ on the number of variables in the ring. See trac ticket
++ :trac:`11856`. With Singular 4, it is by default optimized
++ for at least 4 variables on 64-bit and 2 variables on 32-bit,
++ which in both cases makes a maximal default exponent of
++ 2^16-1.
+
+- sage: P.<x,y,z> = QQ[]
+- sage: y^2^30
+- Traceback (most recent call last):
+- ...
+- OverflowError: Exponent overflow (1073741824).
+- sage: P.<x,y> = QQ[]
+- sage: y^2^30
+- y^1073741824 # 64-bit
+- Traceback (most recent call last): # 32-bit
+- ... # 32-bit
+- OverflowError: Exponent overflow (1073741824). # 32-bit
++ EXAMPLES::
+
+- sage: x^2^30*x^2^30
++ sage: P.<x,y> = QQ[]
++ sage: y^(2^16-1)
++ y^65535
++ sage: y^2^16
+ Traceback (most recent call last):
+ ...
+- OverflowError: Exponent overflow (2147483648). # 64-bit
+- OverflowError: Exponent overflow (1073741824). # 32-bit
+-
++ OverflowError: exponent overflow (65536)
+ """
+- # 2^31 (pPower takes ints)
+- if unlikely(e >= _ring.bitmask or e >= 2**31):
+- raise OverflowError("Exponent overflow (%d)."%(e))
+- return 0
++ if unlikely(e > _ring.bitmask):
++ raise OverflowError("exponent overflow (%d)"%(e))
++
+
+ cdef init_libsingular():
+ """
+@@ -712,18 +761,26 @@ cdef init_libsingular():
+
+ cdef void *handle = NULL
+
+- for extension in ["so", "dylib", "dll"]:
+- lib = os.environ['SAGE_LOCAL']+"/lib/libsingular."+extension
+- if os.path.exists(lib):
+- handle = dlopen(lib, RTLD_GLOBAL|RTLD_LAZY)
+- if not handle:
+- err = dlerror()
+- if err:
+- print(err)
+- break
++ import os
++ from sage.env import SAGE_LOCAL
++ UNAME = os.uname()[0]
++ if UNAME[:6] == "CYGWIN":
++ extension = "dll"
++ elif UNAME == "Darwin":
++ extension = "dylib"
++ else:
++ extension = "so"
++
++ # library name changed from libsingular to libSingular btw 3.x and 4.x
++ lib = SAGE_LOCAL+"/lib/libSingular."+extension
++
++ if not os.path.exists(lib):
++ raise ImportError("cannot locate Singular library ({})".format(lib))
+
+- if handle == NULL:
+- raise ImportError("cannot load libSINGULAR library")
++ handle = dlopen(lib, RTLD_GLOBAL|RTLD_LAZY)
++ if not handle:
++ err = dlerror()
++ raise ImportError("cannot load Singular library ({})".format(err))
+
+ # load SINGULAR
+ siInit(lib)
+@@ -737,9 +794,7 @@ cdef init_libsingular():
+ _saved_options = (int(singular_options), 0, 0)
+ _saved_verbose_options = int(singular_verbose_options)
+
+- On(SW_USE_NTL)
+- On(SW_USE_NTL_GCD_0)
+- On(SW_USE_NTL_GCD_P)
++ #On(SW_USE_NTL)
+ On(SW_USE_EZGCD)
+ Off(SW_USE_NTL_SORT)
+
+diff --git a/src/sage/misc/cython.py b/src/sage/misc/cython.py
+index 2348c4b..8abb91c 100644
+--- a/src/sage/misc/cython.py
++++ b/src/sage/misc/cython.py
+@@ -310,7 +310,7 @@ def cython(filename, verbose=False, compile_message=False,
+ sage: code = [
+ ....: "#clang C++",
+ ....: "#cinclude %s/include/singular %s/include/factory"%(SAGE_LOCAL, SAGE_LOCAL),
+- ....: "#clib m readline singular givaro ntl gmpxx gmp",
++ ....: "#clib m readline Singular givaro ntl gmpxx gmp",
+ ....: "from sage.rings.polynomial.multi_polynomial_libsingular cimport MPolynomial_libsingular",
+ ....: "from sage.libs.singular.polynomial cimport singular_polynomial_pow",
+ ....: "def test(MPolynomial_libsingular p):",
+diff --git a/src/sage/rings/multi_power_series_ring_element.py b/src/sage/rings/multi_power_series_ring_element.py
+index 6388859..142f38b 100644
+--- a/src/sage/rings/multi_power_series_ring_element.py
++++ b/src/sage/rings/multi_power_series_ring_element.py
+@@ -1690,9 +1690,9 @@ class MPowerSeries(PowerSeries):
+ sage: aa.is_gen()
+ False
+ sage: aa.integral(aa)
+- -2*a^2
++ 3*a^2
+ sage: aa.integral(a)
+- -2*a^2
++ 3*a^2
+ """
+ P = self.parent()
+ R = P.base_ring()
+diff --git a/src/sage/rings/polynomial/multi_polynomial_ideal.py b/src/sage/rings/polynomial/multi_polynomial_ideal.py
+index 816c448..53df08a 100644
+--- a/src/sage/rings/polynomial/multi_polynomial_ideal.py
++++ b/src/sage/rings/polynomial/multi_polynomial_ideal.py
+@@ -90,8 +90,8 @@ Or we can work with `\ZZ/17\ZZ` directly::
+
+ sage: a^2 + b^2 == 0
+ True
+- sage: a^3 - b^2
+- -a*b^2 - b^2
++ sage: a^3 - b^2 == -a*b^2 - b^2 == 16*a*b^2 + 16*b^2
++ True
+ sage: (a+b)^17
+ a*b^16 + b^17
+ sage: S(17) == 0
+@@ -187,10 +187,10 @@ when the system has no solutions over the rationals.
+ sage: I.change_ring(P.change_ring( GF(11777 ))).groebner_basis()
+ [x + 5633, y - 3007, z - 2626]
+
+- The Groebner basis modulo any product of the prime factors is also non-trivial. ::
++ The Groebner basis modulo any product of the prime factors is also non-trivial::
+
+ sage: I.change_ring(P.change_ring( IntegerModRing(2*7) )).groebner_basis()
+- [x + y + z, y^2 + 3*y, y*z + 11*y + 4, 2*y + 6, z^2 + 3, 2*z + 10]
++ [x + 3*y + 11*z, y^2 + 3*y, y*z + 11*y + 4, 2*y + 6, z^2 + 3, 2*z + 10]
+
+ Modulo any other prime the Groebner basis is trivial so there are
+ no other solutions. For example::
+@@ -712,10 +712,10 @@ class MPolynomialIdeal_singular_repr(
+ sage: p = z^2 + 1; q = z^3 + 2
+ sage: I = (p*q^2, y-z^2)*R
+ sage: pd = I.complete_primary_decomposition(); pd
+- [(Ideal (z^6 + 4*z^3 + 4, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field,
+- Ideal (z^3 + 2, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field),
+- (Ideal (z^2 + 1, y + 1) of Multivariate Polynomial Ring in x, y, z over Rational Field,
+- Ideal (z^2 + 1, y + 1) of Multivariate Polynomial Ring in x, y, z over Rational Field)]
++ [(Ideal (z^2 + 1, y + 1) of Multivariate Polynomial Ring in x, y, z over Rational Field,
++ Ideal (z^2 + 1, y + 1) of Multivariate Polynomial Ring in x, y, z over Rational Field),
++ (Ideal (z^6 + 4*z^3 + 4, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field,
++ Ideal (z^3 + 2, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field)]
+
+ sage: I.primary_decomposition_complete(algorithm = 'gtz')
+ [(Ideal (z^6 + 4*z^3 + 4, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field,
+@@ -832,8 +832,8 @@ class MPolynomialIdeal_singular_repr(
+ sage: p = z^2 + 1; q = z^3 + 2
+ sage: I = (p*q^2, y-z^2)*R
+ sage: pd = I.primary_decomposition(); pd
+- [Ideal (z^6 + 4*z^3 + 4, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field,
+- Ideal (z^2 + 1, y + 1) of Multivariate Polynomial Ring in x, y, z over Rational Field]
++ [Ideal (z^2 + 1, y + 1) of Multivariate Polynomial Ring in x, y, z over Rational Field,
++ Ideal (z^6 + 4*z^3 + 4, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field]
+
+ ::
+
+@@ -904,8 +904,8 @@ class MPolynomialIdeal_singular_repr(
+ sage: p = z^2 + 1; q = z^3 + 2
+ sage: I = (p*q^2, y-z^2)*R
+ sage: pd = I.associated_primes(); pd
+- [Ideal (z^3 + 2, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field,
+- Ideal (z^2 + 1, y + 1) of Multivariate Polynomial Ring in x, y, z over Rational Field]
++ [Ideal (z^2 + 1, y + 1) of Multivariate Polynomial Ring in x, y, z over Rational Field,
++ Ideal (z^3 + 2, y - z^2) of Multivariate Polynomial Ring in x, y, z over Rational Field]
+
+ ALGORITHM:
+
+@@ -3623,9 +3623,12 @@ class MPolynomialIdeal( MPolynomialIdeal_singular_repr, \
+ sage: P.<a,b,c> = PolynomialRing(ZZ,3)
+ sage: I = P * (a + 2*b + 2*c - 1, a^2 - a + 2*b^2 + 2*c^2, 2*a*b + 2*b*c - b)
+ sage: I.groebner_basis()
+- [b^3 - 23*b*c^2 + 3*b^2 + 5*b*c, 2*b*c^2 - 6*c^3 - b^2 - b*c + 2*c^2,
+- 42*c^3 + 5*b^2 + 4*b*c - 14*c^2, 2*b^2 + 6*b*c + 6*c^2 - b - 2*c,
+- 10*b*c + 12*c^2 - b - 4*c, a + 2*b + 2*c - 1]
++ [b^3 - 181*b*c^2 + 222*c^3 - 26*b*c - 146*c^2 + 19*b + 24*c,
++ 2*b*c^2 - 48*c^3 + 3*b*c + 22*c^2 - 2*b - 2*c,
++ 42*c^3 + 45*b^2 + 54*b*c + 22*c^2 - 13*b - 12*c,
++ 2*b^2 + 6*b*c + 6*c^2 - b - 2*c,
++ 10*b*c + 12*c^2 - b - 4*c,
++ a + 2*b + 2*c - 1]
+
+ ::
+
+@@ -3642,7 +3645,7 @@ class MPolynomialIdeal( MPolynomialIdeal_singular_repr, \
+ sage: I = P * (a + 2*b + 2*c - 1, a^2 - a + 2*b^2 + 2*c^2, 2*a*b + 2*b*c - b)
+ sage: I.groebner_basis()
+ [b*c^2 + 992*b*c + 712*c^2 + 332*b + 96*c,
+- 2*c^3 + 589*b*c + 862*c^2 + 762*b + 268*c,
++ 2*c^3 + 214*b*c + 862*c^2 + 762*b + 268*c,
+ b^2 + 438*b*c + 281*b,
+ 5*b*c + 156*c^2 + 112*b + 948*c,
+ 50*c^2 + 600*b + 650*c, a + 2*b + 2*c + 999, 125*b]
+@@ -3652,7 +3655,6 @@ class MPolynomialIdeal( MPolynomialIdeal_singular_repr, \
+ sage: R.<x,y,z> = PolynomialRing(Zmod(2233497349584))
+ sage: I = R.ideal([z*(x-3*y), 3^2*x^2-y*z, z^2+y^2])
+ sage: I.groebner_basis()
+- verbose 0 (...: multi_polynomial_ideal.py, groebner_basis) Warning: falling back to very slow toy implementation.
+ [2*z^4, y*z^2 + 81*z^3, 248166372176*z^3, 9*x^2 - y*z, y^2 + z^2, x*z +
+ 2233497349581*y*z, 248166372176*y*z]
+
+diff --git a/src/sage/rings/polynomial/multi_polynomial_ideal_libsingular.pyx b/src/sage/rings/polynomial/multi_polynomial_ideal_libsingular.pyx
+index b66653c..902283d 100644
+--- a/src/sage/rings/polynomial/multi_polynomial_ideal_libsingular.pyx
++++ b/src/sage/rings/polynomial/multi_polynomial_ideal_libsingular.pyx
+@@ -52,11 +52,12 @@ Two examples from the Mathematica documentation (done in Sage):
+ include "cysignals/signals.pxi"
+
+ from sage.libs.singular.decl cimport tHomog, number, IDELEMS, p_Copy, rChangeCurrRing
+-from sage.libs.singular.decl cimport idInit, id_Delete, currRing, currQuotient, Sy_bit, OPT_REDSB
+-from sage.libs.singular.decl cimport scKBase, poly, testHomog, idSkipZeroes, idRankFreeModule, kStd
++from sage.libs.singular.decl cimport idInit, id_Delete, currRing, Sy_bit, OPT_REDSB
++from sage.libs.singular.decl cimport scKBase, poly, testHomog, idSkipZeroes, id_RankFreeModule, kStd
+ from sage.libs.singular.decl cimport OPT_REDTAIL, singular_options, kInterRed, t_rep_gb, p_GetCoeff
+ from sage.libs.singular.decl cimport pp_Mult_nn, p_Delete, n_Delete
+ from sage.libs.singular.decl cimport rIsPluralRing
++from sage.libs.singular.decl cimport n_unknown, n_Zp, n_Q, n_R, n_GF, n_long_R, n_algExt,n_transExt,n_long_C, n_Z, n_Zn, n_Znm, n_Z2m, n_CF
+
+ from sage.rings.polynomial.multi_polynomial_libsingular cimport new_MP
+ from sage.rings.polynomial.plural cimport new_NCP
+@@ -174,7 +175,7 @@ def kbase_libsingular(I):
+
+ cdef ideal *i = sage_ideal_to_singular_ideal(I)
+ cdef ring *r = currRing
+- cdef ideal *q = currQuotient
++ cdef ideal *q = currRing.qideal
+
+ cdef ideal *result
+ singular_options = singular_options | Sy_bit(OPT_REDSB)
+@@ -244,7 +245,7 @@ def slimgb_libsingular(I):
+ id_Delete(&i, r)
+ raise TypeError("ordering must be global for slimgb")
+
+- if i.rank < idRankFreeModule(i, r):
++ if i.rank < id_RankFreeModule(i, r):
+ id_Delete(&i, r)
+ raise TypeError
+
+@@ -274,12 +275,12 @@ def interred_libsingular(I):
+ sage: P.<x,y,z> = PolynomialRing(ZZ)
+ sage: I = ideal( x^2 - 3*y, y^3 - x*y, z^3 - x, x^4 - y*z + 1 )
+ sage: I.interreduced_basis()
+- [y^3 - x*y, z^3 - x, x^2 - 3*y, 9*y^2 - y*z + 1]
++ [y*z^2 - 81*x*y - 9*y - z, z^3 - x, x^2 - 3*y, 9*y^2 - y*z + 1]
+
+ sage: P.<x,y,z> = PolynomialRing(QQ)
+ sage: I = ideal( x^2 - 3*y, y^3 - x*y, z^3 - x, x^4 - y*z + 1 )
+ sage: I.interreduced_basis()
+- [y*z^2 - 81*x*y - 9*y - z, z^3 - x, x^2 - 3*y, y^2 - 1/9*y*z + 1/9]
++ [y*z^2 - 81*x*y - 9*y - z, z^3 - x, x^2 - 3*y, 9*y^2 - y*z + 1]
+ """
+ global singular_options
+
+@@ -296,7 +297,7 @@ def interred_libsingular(I):
+ return Sequence([], check=False, immutable=True)
+ except AttributeError:
+ pass
+-
++
+ i = sage_ideal_to_singular_ideal(I)
+ r = currRing
+
+@@ -309,12 +310,12 @@ def interred_libsingular(I):
+
+
+ # divide head by coefficients
+- if r.ringtype == 0:
++ if r.cf.type == n_unknown:
+ for j from 0 <= j < IDELEMS(result):
+ p = result.m[j]
+ if p:
+ n = p_GetCoeff(p,r)
+- n = r.cf.nInvers(n)
++ n = r.cf.cfInvers(n,r.cf)
+ result.m[j] = pp_Mult_nn(p, n, r)
+ p_Delete(&p,r)
+ n_Delete(&n,r)
+@@ -325,5 +326,3 @@ def interred_libsingular(I):
+
+ id_Delete(&result,r)
+ return res
+-
+-
+diff --git a/src/sage/rings/polynomial/multi_polynomial_libsingular.pyx b/src/sage/rings/polynomial/multi_polynomial_libsingular.pyx
+index 4210fd4..81f64bb 100644
+--- a/src/sage/rings/polynomial/multi_polynomial_libsingular.pyx
++++ b/src/sage/rings/polynomial/multi_polynomial_libsingular.pyx
+@@ -170,19 +170,20 @@ include "cysignals/signals.pxi"
+
+ # singular types
+ from sage.libs.singular.decl cimport ring, poly, ideal, intvec, number, currRing
++from sage.libs.singular.decl cimport n_unknown, n_Zp, n_Q, n_R, n_GF, n_long_R, n_algExt,n_transExt,n_long_C, n_Z, n_Zn, n_Znm, n_Z2m, n_CF
+
+ # singular functions
+ from sage.libs.singular.decl cimport (
+- errorreported, libfac_interruptflag,
++ errorreported,
+ p_ISet, rChangeCurrRing, p_Copy, p_Init, p_SetCoeff, p_Setm, p_SetExp, p_Add_q,
+ p_NSet, p_GetCoeff, p_Delete, p_GetExp, pNext, rRingVar, omAlloc0, omStrDup,
+ omFree, pDivide, p_SetCoeff0, n_Init, p_DivisibleBy, pLcm, p_LmDivisibleBy,
+ pDivide, p_IsConstant, p_ExpVectorEqual, p_String, p_LmInit, n_Copy,
+- p_IsUnit, pInvers, p_Head, idInit, fast_map, id_Delete,
+- pIsHomogeneous, pHomogen, p_Totaldegree, singclap_pdivide, singclap_factorize,
++ p_IsUnit, pInvers, p_Head, idInit, fast_map_common_subexp, id_Delete,
++ p_IsHomogeneous, pHomogen, p_Totaldegree,pLDeg1_Totaldegree, singclap_pdivide, singclap_factorize,
+ idLift, IDELEMS, On, Off, SW_USE_CHINREM_GCD, SW_USE_EZGCD,
+ p_LmIsConstant, pTakeOutComp1, singclap_gcd, pp_Mult_qq, p_GetMaxExp,
+- pLength, kNF, singclap_isSqrFree, p_Neg, p_Minus_mm_Mult_qq, p_Plus_mm_Mult_qq,
++ pLength, kNF, p_Neg, p_Minus_mm_Mult_qq, p_Plus_mm_Mult_qq,
+ pDiff, singclap_resultant, p_Normalize,
+ prCopyR, prCopyR_NoSort )
+
+@@ -219,10 +220,12 @@ from sage.rings.integer cimport Integer
+ from sage.rings.finite_rings.integer_mod_ring import is_IntegerModRing
+ from sage.rings.number_field.number_field_base cimport NumberField
+
+-from sage.arith.all import gcd
++from sage.rings.arith import gcd
+ from sage.structure.element import coerce_binop
+
+ from sage.structure.parent cimport Parent
++from sage.structure.parent_base cimport ParentWithBase
++from sage.structure.parent_gens cimport ParentWithGens
+ from sage.structure.category_object cimport CategoryObject
+
+ from sage.structure.element cimport EuclideanDomainElement
+@@ -586,6 +589,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+ Coercion from SINGULAR elements::
+
+ sage: P._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 3
+ // block 1 : ordering dp
+@@ -806,7 +810,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+ if element.parent() is base_ring:
+ # shortcut for GF(p)
+ if isinstance(base_ring, FiniteField_prime_modn):
+- _p = p_ISet(int(element) % _ring.ch, _ring)
++ _p = p_ISet(int(element) % _ring.cf.ch, _ring)
+ else:
+ _n = sa2si(element,_ring)
+ _p = p_NSet(_n, _ring)
+@@ -830,7 +834,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ elif isinstance(element, int) or isinstance(element, long):
+ if isinstance(base_ring, FiniteField_prime_modn):
+- _p = p_ISet(element % _ring.ch, _ring)
++ _p = p_ISet(element % _ring.cf.ch, _ring)
+ else:
+ _n = sa2si(base_ring(element), _ring)
+ _p = p_NSet(_n, _ring)
+@@ -977,7 +981,6 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ if is_Macaulay2Element(element):
+ return self(element.external_string())
+-
+ try:
+ return self(str(element))
+ except TypeError:
+@@ -1174,6 +1177,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: P.<x,y,z> = QQ[]
+ sage: P._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 3
+ // block 1 : ordering dp
+@@ -1189,6 +1193,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+ sage: k.<a> = GF(3^3)
+ sage: P.<x,y,z> = PolynomialRing(k,3)
+ sage: P._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 3
+ // 1 parameter : a
+ // minpoly : (a^3-a+1)
+@@ -1206,6 +1211,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+ TESTS:
+ sage: P.<x> = QQ[]
+ sage: P._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -1245,6 +1251,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: P.<x,y,z> = QQ[]
+ sage: P._singular_init_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 3
+ // block 1 : ordering dp
+@@ -1259,6 +1266,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+ sage: w = var('w')
+ sage: R.<x,y> = PolynomialRing(NumberField(w^2+1,'s'))
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // 1 parameter : s
+ // minpoly : (s^2+1)
+@@ -1269,6 +1277,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = PolynomialRing(GF(2**8,'a'),10,'x', order='invlex')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 2
+ // 1 parameter : a
+ // minpoly : (a^8+a^4+a^3+a^2+1)
+@@ -1279,6 +1288,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = PolynomialRing(GF(127),2,'x', order='invlex')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 127
+ // number of vars : 2
+ // block 1 : ordering rp
+@@ -1287,6 +1297,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = PolynomialRing(QQ,2,'x', order='invlex')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering rp
+@@ -1295,6 +1306,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = PolynomialRing(QQ,2,'x', order='degneglex')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering a
+@@ -1306,6 +1318,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = PolynomialRing(QQ,'x')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -1314,6 +1327,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = PolynomialRing(GF(127),'x')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 127
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -1322,7 +1336,8 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = ZZ['x,y']
+ sage: singular(R)
+- // coeff. ring is : Integers
++ polynomial ring, over a domain, global ordering
++ // coeff. ring is : integer
+ // number of vars : 2
+ // block 1 : ordering dp
+ // : names x y
+@@ -1330,6 +1345,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = IntegerModRing(1024)['x,y']
+ sage: singular(R)
++ polynomial ring, over a ring (with zero-divisors), global ordering
+ // coeff. ring is : Z/2^10
+ // number of vars : 2
+ // block 1 : ordering dp
+@@ -1338,7 +1354,8 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: R = IntegerModRing(15)['x,y']
+ sage: singular(R)
+- // coeff. ring is : Z/15
++ polynomial ring, over a ring (with zero-divisors), global ordering
++ // coeff. ring is : ZZ/15
+ // number of vars : 2
+ // block 1 : ordering dp
+ // : names x y
+@@ -1348,6 +1365,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+
+ sage: P.<x> = QQ[]
+ sage: P._singular_init_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -1370,14 +1388,14 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+ # singular converts to bits from base_10 in mpr_complex.cc by:
+ # size_t bits = 1 + (size_t) ((float)digits * 3.5);
+ precision = base_ring.precision()
+- digits = sage.arith.all.ceil((2*precision - 2)/7.0)
++ digits = sage.rings.arith.ceil((2*precision - 2)/7.0)
+ self.__singular = singular.ring("(real,%d,0)"%digits, _vars, order=order)
+
+ elif is_ComplexField(base_ring):
+ # singular converts to bits from base_10 in mpr_complex.cc by:
+ # size_t bits = 1 + (size_t) ((float)digits * 3.5);
+ precision = base_ring.precision()
+- digits = sage.arith.all.ceil((2*precision - 2)/7.0)
++ digits = sage.rings.arith.ceil((2*precision - 2)/7.0)
+ self.__singular = singular.ring("(complex,%d,0,I)"%digits, _vars, order=order)
+
+ elif base_ring.is_prime_field():
+@@ -1615,8 +1633,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+ 9/4
+
+ sage: P.monomial_quotient(x,y) # Note the wrong result
+- x*y^1048575*z^1048575 # 64-bit
+- x*y^65535*z^65535 # 32-bit
++ x*y^65535*z^65535
+
+ sage: P.monomial_quotient(x,P(1))
+ x
+@@ -1645,8 +1662,8 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_generic):
+ if r!=currRing: rChangeCurrRing(r) # pDivide
+ res = pDivide(f._poly, g._poly)
+ if coeff:
+- if r.ringtype == 0 or r.cf.nDivBy(p_GetCoeff(f._poly, r), p_GetCoeff(g._poly, r)):
+- n = r.cf.nDiv( p_GetCoeff(f._poly, r) , p_GetCoeff(g._poly, r))
++ if r.cf.type == n_unknown or r.cf.cfDivBy(p_GetCoeff(f._poly, r), p_GetCoeff(g._poly, r), r.cf):
++ n = r.cf.cfDiv( p_GetCoeff(f._poly, r) , p_GetCoeff(g._poly, r), r.cf)
+ p_SetCoeff0(res, n, r)
+ else:
+ raise ArithmeticError("Cannot divide these coefficients.")
+@@ -2277,10 +2294,10 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ 9/4*x^2 - 1/4*y^2 - y - 1
+
+ sage: P.<x,y> = PolynomialRing(QQ,order='lex')
+- sage: (x^2^30) * x^2^30
++ sage: (x^2^15) * x^2^15
+ Traceback (most recent call last):
+ ...
+- OverflowError: Exponent overflow (...).
++ OverflowError: exponent overflow (...)
+ """
+ # all currently implemented rings are commutative
+ cdef poly *_p
+@@ -2391,10 +2408,10 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ TypeError: non-integral exponents not supported
+
+ sage: P.<x,y> = PolynomialRing(QQ,order='lex')
+- sage: (x+y^2^30)^10
++ sage: (x+y^2^15)^10
+ Traceback (most recent call last):
+ ....
+- OverflowError: Exponent overflow (...).
++ OverflowError: exponent overflow (...)
+ """
+ if type(exp) is not Integer:
+ try:
+@@ -2541,7 +2558,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ argument ``std_grading=True``.
+
+ sage: tord = TermOrder(matrix([3,0,1,1,1,0,1,0,0]))
+- sage: R.<x,y,z> = PolynomialRing(QQ,'x',3,order=tord)
++ sage: R.<x,y,z> = PolynomialRing(QQ,3,order=tord)
+ sage: (x^3*y+x*z^4).degree()
+ 9
+ sage: (x^3*y+x*z^4).degree(std_grading=True)
+@@ -2650,10 +2667,10 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+
+ With a matrix term ordering, the grading changes.
+ To evaluate the total degree using the standard grading,
+- use the optional argument``std_grading=True``.
++ use the optional argument``std_grading=True``::
+
+ sage: tord=TermOrder(matrix([3,0,1,1,1,0,1,0,0]))
+- sage: R.<x,y,z> = PolynomialRing(QQ,'x',3,order=tord)
++ sage: R.<x,y,z> = PolynomialRing(QQ,3,order=tord)
+ sage: (x^2*y).total_degree()
+ 6
+ sage: (x^2*y).total_degree(std_grading=True)
+@@ -3114,7 +3131,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ """
+ cdef ring *_ring = self._parent_ring
+ if(_ring != currRing): rChangeCurrRing(_ring)
+- return bool(pIsHomogeneous(self._poly))
++ return bool(p_IsHomogeneous(self._poly,_ring))
+
+ cpdef _homogenize(self, int var):
+ """
+@@ -3184,7 +3201,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ _p = p_Head(self._poly, _ring)
+ _n = p_GetCoeff(_p, _ring)
+
+- ret = bool((not self._poly.next) and _ring.cf.nIsOne(_n))
++ ret = bool((not self._poly.next) and _ring.cf.cfIsOne(_n,_ring.cf))
+
+ p_Delete(&_p, _ring)
+ return ret
+@@ -3274,17 +3291,16 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ We are catching overflows::
+
+ sage: R.<x,y> = QQ[]
+- sage: n=1000; f = x^n
++ sage: n=100; f = x^n
+ sage: try:
+ ....: f.subs(x = x^n)
+ ....: print("no overflow")
+ ....: except OverflowError:
+- ....: print("overflow")
+- overflow # 32-bit
+- x^1000000 # 64-bit
+- no overflow # 64-bit
++ ....: print "overflow"
++ x^10000
++ no overflow
+
+- sage: n=100000;
++ sage: n=1000;
+ sage: try:
+ ....: f = x^n
+ ....: f.subs(x = x^n)
+@@ -3360,7 +3376,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ if degree > _ring.bitmask:
+ id_Delete(&to_id, _ring)
+ p_Delete(&_p, _ring)
+- raise OverflowError("Exponent overflow (%d)."%(degree))
++ raise OverflowError("exponent overflow (%d)"%(degree))
+ to_id.m[mi-1] = p_Copy(_f, _ring)
+
+ if _p == NULL:
+@@ -3398,7 +3414,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ if degree > _ring.bitmask:
+ id_Delete(&to_id, _ring)
+ p_Delete(&_p, _ring)
+- raise OverflowError("Exponent overflow (%d)."%(degree))
++ raise OverflowError("exponent overflow (%d)"%(degree))
+ need_map = 1
+
+ if _p == NULL:
+@@ -3417,7 +3433,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ from_id.m[0] = _p
+
+ rChangeCurrRing(_ring)
+- res_id = fast_map(from_id, _ring, to_id, _ring)
++ res_id = fast_map_common_subexp(from_id, _ring, to_id, _ring)
+ _p = res_id.m[0]
+
+ from_id.m[0] = NULL
+@@ -3595,7 +3611,10 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ Univariate Polynomial Ring in x over Rational Field
+ """
+ cdef poly *p = self._poly
++ cdef poly *p2 = self._poly
+ cdef ring *r = self._parent_ring
++ cdef long pTotDegMax
++
+ k = self.base_ring()
+
+ if not self.is_univariate():
+@@ -3609,12 +3628,20 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ R = self.base_ring()[str(self.variables()[0])]
+
+ zero = k(0)
+- coefficients = [zero] * (self.degree() + 1)
+
+ if(r != currRing): rChangeCurrRing(r)
+
++ pTotDegMax = -1
++ while p2:
++ pTotDegMax = max(pTotDegMax, p_Totaldegree(p2, r))
++ p2 = pNext(p2)
++
++ coefficients = [zero] * (pTotDegMax + 1)
+ while p:
+- coefficients[p_Totaldegree(p, r)] = si2sa(p_GetCoeff(p, r), r, k)
++ pTotDeg = p_Totaldegree(p, r)
++ if ( pTotDeg >= len(coefficients) or pTotDeg < 0 ):
++ raise IndexError("list index("+str(pTotDeg)+" out of range(0-"+str(len(coefficients))+")")
++ coefficients[pTotDeg] = si2sa(p_GetCoeff(p, r), r, k)
+ p = pNext(p)
+
+ return R(coefficients)
+@@ -3931,8 +3958,8 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ _self = <MPolynomial_libsingular>self
+ _right = <MPolynomial_libsingular>right
+
+- if r.ringtype != 0:
+- if r.ringtype == 4:
++ if r.cf.type != n_unknown:
++ if r.cf.type == n_Z:
+ P = parent.change_ring(RationalField())
+ f = P(self)//P(right)
+ CM = list(f)
+@@ -3948,13 +3975,14 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ quo = p_Add_q(quo, temp, r)
+ p = pNext(p)
+ return new_MP(parent, quo)
+- raise NotImplementedError("Division of multivariate polynomials over non fields by non-monomials not implemented.")
++ if r.cf.type == n_Znm or r.cf.type == n_Zn or r.cf.type == n_Z2m :
++ raise NotImplementedError("Division of multivariate polynomials over non fields by non-monomials not implemented.")
+
+ cdef int count = singular_polynomial_length_bounded(_self._poly,15)
+ if count >= 15: # note that _right._poly must be of shorter length than self._poly for us to care about this call
+ sig_on()
+ if r!=currRing: rChangeCurrRing(r) # singclap_pdivide
+- quo = singclap_pdivide( _self._poly, _right._poly )
++ quo = singclap_pdivide( _self._poly, _right._poly, r )
+ if count >= 15:
+ sig_off()
+ f = new_MP(parent, quo)
+@@ -4230,7 +4258,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ iv = NULL
+ sig_on()
+ if _ring!=currRing: rChangeCurrRing(_ring) # singclap_factorize
+- I = singclap_factorize ( ptemp, &iv , 0)
++ I = singclap_factorize ( ptemp, &iv , 0, _ring)
+ sig_off()
+
+ ivv = iv.ivGetVec()
+@@ -4290,10 +4318,10 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ ValueError: polynomial is not in the ideal
+ sage: foo = I.complete_primary_decomposition() # indirect doctest
+ sage: foo[0][0]
+- Ideal (x2 - 1, x1 - 1) of Multivariate Polynomial Ring in x1, x2 over Rational Field
++ Ideal (x1 + 1, x2^2 - 3) of Multivariate Polynomial Ring in x1, x2 over Rational Field
+
+ """
+- global errorreported, libfac_interruptflag
++ global errorreported
+ if not self._parent._base.is_field():
+ raise NotImplementedError("Lifting of multivariate polynomials over non-fields is not implemented.")
+
+@@ -4327,10 +4355,9 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+
+ if r!=currRing: rChangeCurrRing(r) # idLift
+ res = idLift(_I, fI, NULL, 0, 0, 0)
+- if errorreported != 0 or libfac_interruptflag != 0:
++ if errorreported != 0 :
+ errorcode = errorreported
+ errorreported = 0
+- libfac_interruptflag = 0
+ if errorcode == 1:
+ raise ValueError("polynomial is not in the ideal")
+ raise RuntimeError
+@@ -4561,14 +4588,17 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ else:
+ raise TypeError("algorithm %s not supported" % algorithm)
+
+- if _ring.ringtype != 0:
+- if _ring.ringtype == 4:
++ if _ring.cf.type != n_unknown:
++ if _ring.cf.type == n_Z:
+ P = self._parent.change_ring(RationalField())
+ res = P(self).gcd(P(right))
+ coef = sage.rings.integer.GCD_list(self.coefficients() + right.coefficients())
+ return self._parent(coef*res)
+
+- raise NotImplementedError("GCD over rings not implemented.")
++ #TODO:
++ if _ring.cf.type == n_Znm or _ring.cf.type == n_Zn or _ring.cf.type == n_Z2m :
++ raise NotImplementedError("GCD over rings not implemented.")
++ #raise NotImplementedError("GCD over rings not implemented.")
+
+ if self._parent._base.is_finite() and self._parent._base.characteristic() > 1<<29:
+ raise NotImplementedError("GCD of multivariate polynomials over prime fields with characteristic > 2^29 is not implemented.")
+@@ -4586,7 +4616,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ if count >= 20:
+ sig_on()
+ if _ring!=currRing: rChangeCurrRing(_ring) # singclap_gcd
+- _res = singclap_gcd(p_Copy(self._poly, _ring), p_Copy(_right._poly, _ring))
++ _res = singclap_gcd(p_Copy(self._poly, _ring), p_Copy(_right._poly, _ring), _ring )
+ if count >= 20:
+ sig_off()
+
+@@ -4632,14 +4662,15 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ cdef MPolynomial_libsingular _g
+ if _ring!=currRing: rChangeCurrRing(_ring)
+
+- if _ring.ringtype != 0:
+- if _ring.ringtype == 4:
++ if _ring.cf.type != n_unknown:
++ if _ring.cf.type == n_Z:
+ P = self.parent().change_ring(RationalField())
+ py_gcd = P(self).gcd(P(g))
+ py_prod = P(self*g)
+ return self.parent(py_prod//py_gcd)
+ else:
+- raise TypeError("LCM over non-integral domains not available.")
++ if _ring.cf.type == n_Znm or _ring.cf.type == n_Zn or _ring.cf.type == n_Z2m :
++ raise TypeError("LCM over non-integral domains not available.")
+
+ if self._parent is not g._parent:
+ _g = self._parent._coerce_c(g)
+@@ -4654,9 +4685,9 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ if count >= 20:
+ sig_on()
+ if _ring!=currRing: rChangeCurrRing(_ring) # singclap_gcd
+- gcd = singclap_gcd(p_Copy(self._poly, _ring), p_Copy(_g._poly, _ring))
++ gcd = singclap_gcd(p_Copy(self._poly, _ring), p_Copy(_g._poly, _ring), _ring )
+ prod = pp_Mult_qq(self._poly, _g._poly, _ring)
+- ret = singclap_pdivide(prod , gcd )
++ ret = singclap_pdivide(prod , gcd , _ring)
+ p_Delete(&prod, _ring)
+ p_Delete(&gcd, _ring)
+ if count >= 20:
+@@ -4677,13 +4708,8 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ sage: h.is_squarefree()
+ False
+ """
+- cdef ring *_ring = self._parent_ring
+-
+- if self._parent._base.is_finite() and self._parent._base.characteristic() > 1<<29:
+- raise NotImplementedError("is_squarefree of multivariate polynomials over prime fields with characteristic > 2^29 is not implemented.")
+-
+- if(_ring != currRing): rChangeCurrRing(_ring)
+- return bool(singclap_isSqrFree(self._poly))
++ # TODO: Use Singular (4.x) intrinsics. (Temporary solution from #17254.)
++ return all([ e == 1 for (f, e) in self.factor() ])
+
+ @coerce_binop
+ def quo_rem(self, MPolynomial_libsingular right):
+@@ -4740,7 +4766,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ if count >= 15: # note that _right._poly must be of shorter length than self._poly for us to care about this call
+ sig_on()
+ if r!=currRing: rChangeCurrRing(r) # singclap_pdivide
+- quo = singclap_pdivide( self._poly, right._poly )
++ quo = singclap_pdivide( self._poly, right._poly, r )
+ rem = p_Add_q(p_Copy(self._poly, r), p_Neg(pp_Mult_qq(right._poly, quo, r), r), r)
+ if count >= 15:
+ sig_off()
+@@ -5181,7 +5207,7 @@ cdef class MPolynomial_libsingular(sage.rings.polynomial.multi_polynomial.MPolyn
+ if count >= 20:
+ sig_on()
+ if _ring != currRing: rChangeCurrRing(_ring) # singclap_resultant
+- rt = singclap_resultant(p_Copy(self._poly, _ring), p_Copy(other._poly, _ring),p_Copy((<MPolynomial_libsingular>variable)._poly, _ring))
++ rt = singclap_resultant(p_Copy(self._poly, _ring), p_Copy(other._poly, _ring), p_Copy((<MPolynomial_libsingular>variable)._poly , _ring ), _ring)
+ if count >= 20:
+ sig_off()
+ return new_MP(self._parent, rt)
+diff --git a/src/sage/rings/polynomial/multi_polynomial_ring_generic.pyx b/src/sage/rings/polynomial/multi_polynomial_ring_generic.pyx
+index d4ff6fd..3abece4 100644
+--- a/src/sage/rings/polynomial/multi_polynomial_ring_generic.pyx
++++ b/src/sage/rings/polynomial/multi_polynomial_ring_generic.pyx
+@@ -850,7 +850,7 @@ cdef class MPolynomialRing_generic(sage.rings.ring.CommutativeRing):
+
+ sage: R.<x> = PolynomialRing(Integers(3), 1)
+ sage: R.random_element()
+- -x^2 + x
++ 2*x^2 + x
+
+ To produce a dense polynomial, pick ``terms=Infinity``::
+
+diff --git a/src/sage/rings/polynomial/pbori.pyx b/src/sage/rings/polynomial/pbori.pyx
+index 54e00d9..13b6cdb 100644
+--- a/src/sage/rings/polynomial/pbori.pyx
++++ b/src/sage/rings/polynomial/pbori.pyx
+@@ -1370,6 +1370,7 @@ cdef class BooleanPolynomialRing(MPolynomialRing_generic):
+
+ sage: B.<x,y> = BooleanPolynomialRing(2)
+ sage: B._singular_() # indirect doctest
++ polynomial ring, over a field, global ordering
+ // characteristic : 2
+ // number of vars : 2
+ // block 1 : ordering lp
+diff --git a/src/sage/rings/polynomial/plural.pxd b/src/sage/rings/polynomial/plural.pxd
+index eec63df..0f0b659 100644
+--- a/src/sage/rings/polynomial/plural.pxd
++++ b/src/sage/rings/polynomial/plural.pxd
+@@ -5,6 +5,10 @@ from sage.structure.parent cimport Parent
+ from sage.libs.singular.function cimport RingWrap
+ from sage.rings.polynomial.multi_polynomial_libsingular cimport MPolynomialRing_libsingular
+
++from sage.libs.singular.decl cimport wFunctionalBuch
++
++from sage.libs.singular.decl cimport p_Totaldegree
++
+ cdef extern from *:
+ ctypedef long Py_hash_t
+
+diff --git a/src/sage/rings/polynomial/plural.pyx b/src/sage/rings/polynomial/plural.pyx
+index bba5da7..83d632a 100644
+--- a/src/sage/rings/polynomial/plural.pyx
++++ b/src/sage/rings/polynomial/plural.pyx
+@@ -110,14 +110,16 @@ from sage.categories.algebras import Algebras
+
+ # singular rings
+
++from sage.libs.singular.ring cimport singular_ring_new, singular_ring_delete, wrap_ring, singular_ring_reference
++
++from sage.libs.singular.singular cimport si2sa, sa2si, overflow_check
++
++
+ from sage.libs.singular.function cimport RingWrap
+
+ from sage.libs.singular.polynomial cimport (singular_polynomial_call, singular_polynomial_cmp, singular_polynomial_add, singular_polynomial_sub, singular_polynomial_neg, singular_polynomial_pow, singular_polynomial_mul, singular_polynomial_rmul, singular_polynomial_deg, singular_polynomial_str_with_changed_varnames, singular_polynomial_latex, singular_polynomial_str, singular_polynomial_div_coeff)
+
+ import sage.libs.singular.ring
+-from sage.libs.singular.ring cimport singular_ring_new, singular_ring_delete, wrap_ring, singular_ring_reference
+-
+-from sage.libs.singular.singular cimport si2sa, sa2si, overflow_check
+
+ from sage.rings.finite_rings.finite_field_prime_modn import FiniteField_prime_modn
+ from sage.rings.integer cimport Integer
+@@ -485,7 +487,7 @@ cdef class NCPolynomialRing_plural(Ring):
+ if <Parent>element.parent() is base_ring:
+ # shortcut for GF(p)
+ if isinstance(base_ring, FiniteField_prime_modn):
+- _p = p_ISet(int(element) % _ring.ch, _ring)
++ _p = p_ISet(int(element) % _ring.cf.ch, _ring)
+ else:
+ _n = sa2si(element,_ring)
+ _p = p_NSet(_n, _ring)
+@@ -506,7 +508,7 @@ cdef class NCPolynomialRing_plural(Ring):
+ # Accepting int
+ elif isinstance(element, int):
+ if isinstance(base_ring, FiniteField_prime_modn):
+- _p = p_ISet(int(element) % _ring.ch,_ring)
++ _p = p_ISet(int(element) % _ring.cf.ch,_ring)
+ else:
+ _n = sa2si(base_ring(element),_ring)
+ _p = p_NSet(_n, _ring)
+@@ -991,8 +993,8 @@ cdef class NCPolynomialRing_plural(Ring):
+
+ res = pDivide(f._poly,g._poly)
+ if coeff:
+- if r.ringtype == 0 or r.cf.nDivBy(p_GetCoeff(f._poly, r), p_GetCoeff(g._poly, r)):
+- n = r.cf.nDiv( p_GetCoeff(f._poly, r) , p_GetCoeff(g._poly, r))
++ if (r.cf.type == n_unknown) or r.cf.cfDivBy(p_GetCoeff(f._poly, r), p_GetCoeff(g._poly, r), r.cf):
++ n = r.cf.cfDiv( p_GetCoeff(f._poly, r) , p_GetCoeff(g._poly, r), r.cf)
+ p_SetCoeff0(res, n, r)
+ else:
+ raise ArithmeticError("Cannot divide these coefficients.")
+@@ -1371,8 +1373,6 @@ cdef class NCPolynomial_plural(RingElement):
+ if self._parent is not None and (<NCPolynomialRing_plural>self._parent)._ring != NULL and self._poly != NULL:
+ p_Delete(&self._poly, (<NCPolynomialRing_plural>self._parent)._ring)
+
+-# def __call__(self, *x, **kwds): # ?
+-
+ def __reduce__(self):
+ """
+ TEST::
+@@ -1550,10 +1550,10 @@ cdef class NCPolynomial_plural(RingElement):
+ sage: P = A.g_algebra(relations={y*x:-x*y + z}, order='lex')
+ sage: P.inject_variables()
+ Defining x, z, y
+- sage: (x^2^30) * x^2^30
++ sage: (x^2^15) * x^2^15
+ Traceback (most recent call last):
+ ...
+- OverflowError: Exponent overflow (...).
++ OverflowError: exponent overflow (65536)
+ """
+ # all currently implemented rings are commutative
+ cdef poly *_p
+@@ -1620,10 +1620,10 @@ cdef class NCPolynomial_plural(RingElement):
+ sage: P = A.g_algebra(relations={y*x:-x*y + z}, order='lex')
+ sage: P.inject_variables()
+ Defining x, z, y
+- sage: (x+y^2^30)^10
++ sage: (x+y^2^15)^10
+ Traceback (most recent call last):
+ ....
+- OverflowError: Exponent overflow (...).
++ OverflowError: exponent overflow (327680)
+ """
+ if type(exp) is not Integer:
+ try:
+@@ -2327,7 +2327,7 @@ cdef class NCPolynomial_plural(RingElement):
+ """
+ cdef ring *_ring = (<NCPolynomialRing_plural>self._parent)._ring
+ if(_ring != currRing): rChangeCurrRing(_ring)
+- return bool(pIsHomogeneous(self._poly))
++ return bool(p_IsHomogeneous(self._poly,_ring))
+
+
+ def is_monomial(self):
+@@ -2365,7 +2365,7 @@ cdef class NCPolynomial_plural(RingElement):
+ _p = p_Head(self._poly, _ring)
+ _n = p_GetCoeff(_p, _ring)
+
+- ret = bool((not self._poly.next) and _ring.cf.nIsOne(_n))
++ ret = bool((not self._poly.next) and _ring.cf.cfIsOne(_n,_ring.cf))
+
+ p_Delete(&_p, _ring)
+ return ret
+diff --git a/src/sage/rings/polynomial/polynomial_quotient_ring.py b/src/sage/rings/polynomial/polynomial_quotient_ring.py
+index 01c8c84..1c8003f 100644
+--- a/src/sage/rings/polynomial/polynomial_quotient_ring.py
++++ b/src/sage/rings/polynomial/polynomial_quotient_ring.py
+@@ -599,6 +599,7 @@ class PolynomialQuotientRing_generic(CommutativeRing):
+ sage: P.<x> = QQ[]
+ sage: Q = P.quo([(x^2+1)])
+ sage: singular(Q) # indirect doctest
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+diff --git a/src/sage/rings/polynomial/polynomial_singular_interface.py b/src/sage/rings/polynomial/polynomial_singular_interface.py
+index 4784673..43bad63 100644
+--- a/src/sage/rings/polynomial/polynomial_singular_interface.py
++++ b/src/sage/rings/polynomial/polynomial_singular_interface.py
+@@ -80,6 +80,7 @@ class PolynomialRing_singular_repr:
+
+ sage: R.<x,y> = PolynomialRing(CC,'x',2)
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0 (complex:15 digits, additional 0 digits)
+ // 1 parameter : I
+ // minpoly : (I^2+1)
+@@ -89,7 +90,8 @@ class PolynomialRing_singular_repr:
+ // block 2 : ordering C
+ sage: R.<x,y> = PolynomialRing(RealField(100),'x',2)
+ sage: singular(R)
+- // characteristic : 0 (real:29 digits, additional 0 digits)
++ polynomial ring, over a field, global ordering
++ // characteristic : 0 (real)
+ // number of vars : 2
+ // block 1 : ordering dp
+ // : names x y
+@@ -98,6 +100,7 @@ class PolynomialRing_singular_repr:
+ sage: w = var('w')
+ sage: R.<x> = PolynomialRing(NumberField(w^2+1,'s'))
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // 1 parameter : s
+ // minpoly : (s^2+1)
+@@ -108,6 +111,7 @@ class PolynomialRing_singular_repr:
+
+ sage: R = PolynomialRing(GF(127),1,'x')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 127
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -116,6 +120,7 @@ class PolynomialRing_singular_repr:
+
+ sage: R = PolynomialRing(QQ,1,'x')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -124,6 +129,7 @@ class PolynomialRing_singular_repr:
+
+ sage: R = PolynomialRing(QQ,'x')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -132,6 +138,7 @@ class PolynomialRing_singular_repr:
+
+ sage: R = PolynomialRing(GF(127),'x')
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 127
+ // number of vars : 1
+ // block 1 : ordering lp
+@@ -140,6 +147,7 @@ class PolynomialRing_singular_repr:
+
+ sage: R = Frac(ZZ['a,b'])['x,y']
+ sage: singular(R)
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // 2 parameter : a b
+ // minpoly : 0
+@@ -151,6 +159,7 @@ class PolynomialRing_singular_repr:
+
+ sage: R = IntegerModRing(1024)['x,y']
+ sage: singular(R)
++ polynomial ring, over a ring (with zero-divisors), global ordering
+ // coeff. ring is : Z/2^10
+ // number of vars : 2
+ // block 1 : ordering dp
+@@ -159,7 +168,8 @@ class PolynomialRing_singular_repr:
+
+ sage: R = IntegerModRing(15)['x,y']
+ sage: singular(R)
+- // coeff. ring is : Z/15
++ polynomial ring, over a ring (with zero-divisors), global ordering
++ // coeff. ring is : ZZ/15
+ // number of vars : 2
+ // block 1 : ordering dp
+ // : names x y
+@@ -167,7 +177,8 @@ class PolynomialRing_singular_repr:
+
+ sage: R = ZZ['x,y']
+ sage: singular(R)
+- // coeff. ring is : Integers
++ polynomial ring, over a domain, global ordering
++ // coeff. ring is : integer
+ // number of vars : 2
+ // block 1 : ordering dp
+ // : names x y
+@@ -178,6 +189,7 @@ class PolynomialRing_singular_repr:
+ sage: K = R.fraction_field()
+ sage: S = K['y']
+ sage: singular(S)
++ polynomial ring, over a field, global ordering
+ // characteristic : 5
+ // 1 parameter : x
+ // minpoly : 0
+@@ -221,6 +233,7 @@ class PolynomialRing_singular_repr:
+ EXAMPLES::
+
+ sage: PolynomialRing(QQ,'u_ba')._singular_init_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 1
+ // block 1 : ordering lp
+diff --git a/src/sage/rings/polynomial/term_order.py b/src/sage/rings/polynomial/term_order.py
+index 17345c0..46bc69a 100644
+--- a/src/sage/rings/polynomial/term_order.py
++++ b/src/sage/rings/polynomial/term_order.py
+@@ -1665,6 +1665,7 @@ class TermOrder(SageObject):
+ sage: T.singular_str()
+ '(lp(3),Dp(5),lp(2))'
+ sage: P._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 127
+ // number of vars : 10
+ // block 1 : ordering lp
+@@ -1692,6 +1693,7 @@ class TermOrder(SageObject):
+ sage: T.singular_str()
+ '(a(1:2),ls(2),a(1:2),ls(2))'
+ sage: P._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 4
+ // block 1 : ordering a
+diff --git a/src/sage/rings/quotient_ring.py b/src/sage/rings/quotient_ring.py
+index 4c2ea8d..da9083a 100644
+--- a/src/sage/rings/quotient_ring.py
++++ b/src/sage/rings/quotient_ring.py
+@@ -1174,6 +1174,7 @@ class QuotientRing_nc(ring.Ring, sage.structure.parent_gens.ParentWithGens):
+ sage: R.<x,y> = PolynomialRing(QQ)
+ sage: S = R.quotient_ring(x^2+y^2)
+ sage: S._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 0
+ // number of vars : 2
+ // block 1 : ordering dp
+diff --git a/src/sage/rings/quotient_ring_element.py b/src/sage/rings/quotient_ring_element.py
+index 20a1a2d..8e59d6d 100644
+--- a/src/sage/rings/quotient_ring_element.py
++++ b/src/sage/rings/quotient_ring_element.py
+@@ -785,6 +785,7 @@ class QuotientRingElement(RingElement):
+ sage: I = sage.rings.ideal.FieldIdeal(P)
+ sage: Q = P.quo(I)
+ sage: Q._singular_()
++ polynomial ring, over a field, global ordering
+ // characteristic : 2
+ // number of vars : 2
+ // block 1 : ordering dp
+diff --git a/src/sage/schemes/curves/affine_curve.py b/src/sage/schemes/curves/affine_curve.py
+index 40235a1..72c520d 100644
+--- a/src/sage/schemes/curves/affine_curve.py
++++ b/src/sage/schemes/curves/affine_curve.py
+@@ -729,9 +729,9 @@ class AffineCurve(Curve_generic, AlgebraicScheme_subscheme_affine):
+ (Affine Plane Curve over Number Field in a0 with defining polynomial y^4 - 4*y^2 + 16 defined by
+ 24*x^2*ss1^3 + 24*ss1^3 + (a0^3 - 8*a0),
+ Affine Plane Curve over Number Field in a0 with defining polynomial y^4 - 4*y^2 + 16 defined by
+- 24*s1^2*ss0 + (a0^3 - 8*a0)*ss0^2 + (6*a0^3)*s1,
++ 24*s1^2*ss0 + (a0^3 - 8*a0)*ss0^2 + (-6*a0^3)*s1,
+ Affine Plane Curve over Number Field in a0 with defining polynomial y^4 - 4*y^2 + 16 defined by
+- 8*y^2*s0^4 + (-4*a0^3)*y*s0^3 - 32*s0^2 + (a0^3 - 8*a0)*y)
++ 8*y^2*s0^4 + (4*a0^3)*y*s0^3 - 32*s0^2 + (a0^3 - 8*a0)*y)
+
+ ::
+
+@@ -1471,7 +1471,7 @@ class AffinePlaneCurve(AffineCurve):
+ To: Affine Plane Curve over Number Field in a with defining
+ polynomial a^2 + 7 defined by x^2 + y^2 + 7
+ Defn: Defined on coordinates by sending (t) to
+- (((7*a)*t^2 + (a))/(-7*t^2 + 1), (-14*t)/(-7*t^2 + 1))
++ ((-7*t^2 + 7)/((-a)*t^2 + (-a)), 14*t/((-a)*t^2 + (-a)))
+ """
+ para = self.projective_closure(i=0).rational_parameterization().defining_polynomials()
+ # these polynomials are homogeneous in two indeterminants, so dehomogenize wrt one of the variables
+diff --git a/src/sage/schemes/curves/projective_curve.py b/src/sage/schemes/curves/projective_curve.py
+index f666231..e62a177 100644
+--- a/src/sage/schemes/curves/projective_curve.py
++++ b/src/sage/schemes/curves/projective_curve.py
+@@ -1537,7 +1537,7 @@ class ProjectivePlaneCurve(ProjectiveCurve):
+ To: Projective Plane Curve over Number Field in a with defining
+ polynomial a^2 + 1 defined by x^2 + y^2 + z^2
+ Defn: Defined on coordinates by sending (s : t) to
+- (s^2 - t^2 : (a)*s^2 + (a)*t^2 : -2*s*t)
++ ((-a)*s^2 + (-a)*t^2 : s^2 - t^2 : 2*s*t)
+ """
+ if self.genus() != 0:
+ raise TypeError("this curve must have geometric genus zero")
+diff --git a/src/sage/structure/element.pyx b/src/sage/structure/element.pyx
+index 6eaf3ec..1cc469c 100644
+--- a/src/sage/structure/element.pyx
++++ b/src/sage/structure/element.pyx
+@@ -2391,15 +2391,14 @@ cdef class RingElement(ModuleElement):
+ ...
+ OverflowError: Exponent overflow (2147483648).
+
+- Another example from :trac:`2956`; this should overflow on x32
+- and succeed on x64::
++ Another example from :trac:`2956` which always overflows
++ with Singular 4::
+
+ sage: K.<x,y> = ZZ[]
+ sage: (x^12345)^54321
+- x^670592745 # 64-bit
+- Traceback (most recent call last): # 32-bit
+- ... # 32-bit
+- OverflowError: Exponent overflow (670592745). # 32-bit
++ Traceback (most recent call last):
++ ...
++ OverflowError: exponent overflow (670592745)
+
+ """
+ if dummy is not None:
+diff --git a/src/sage/tests/french_book/mpoly.py b/src/sage/tests/french_book/mpoly.py
+index 430b9a3..19975ac 100644
+--- a/src/sage/tests/french_book/mpoly.py
++++ b/src/sage/tests/french_book/mpoly.py
+@@ -163,7 +163,7 @@ Sage example in ./mpoly.tex, line 432::
+ [Ideal (z^17 - 1, y - 2*z^10, x - 3*z^3) of Multivariate
+ Polynomial Ring in x, y, z over Rational Field]
+ sage: J.transformed_basis()
+- [z^17 - 1, -2*z^10 + y, -3*z^3 + x]
++ [z^17 - 1, -2*z^10 + y, -3/4*y^2 + x]
+
+ Sage example in ./mpoly.tex, line 534::
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