#17740: Division of modules by basering elements should not pass to the fraction
field.
-------------------------------------+-------------------------------------
Reporter: robertwb | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.5
Component: coercion | Resolution:
Keywords: | Merged in:
Authors: Robert Bradshaw | Reviewers: Vincent Delecroix
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/17740 | 9c970ae1c2ef9516f61a3c6cc737e6d0c644565e
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Changes (by vbraun):
* status: positive_review => needs_work
Comment:
I'm getting this on OSX:
{{{
sage -t --long src/sage/structure/coerce_actions.pyx
**********************************************************************
File "src/sage/structure/coerce_actions.pyx", line 419, in
sage.structure.coerce_actions.ModuleAction.__invert__
Failed example:
A = ~RightModuleAction(ZZ, GF(5)['x']); A
Exception raised:
Traceback (most recent call last):
File "/Users/buildslave-
sage/slave/sage_git/build/local/lib/python2.7/site-
packages/sage/doctest/forker.py", line 488, in _run
self.compile_and_execute(example, compiler, test.globs)
File "/Users/buildslave-
sage/slave/sage_git/build/local/lib/python2.7/site-
packages/sage/doctest/forker.py", line 850, in compile_and_execute
exec(compiled, globs)
File "<doctest
sage.structure.coerce_actions.ModuleAction.__invert__[10]>", line 1, in
<module>
A = ~RightModuleAction(ZZ, GF(Integer(5))['x']); A
File "sage/structure/coerce_actions.pyx", line 464, in
sage.structure.coerce_actions.ModuleAction.__invert__
(build/cythonized/sage/structure/coerce_actions.c:7385)
module_action = type(self)(K, self.codomain())
File "sage/structure/coerce_actions.pyx", line 376, in
sage.structure.coerce_actions.ModuleAction.codomain
(build/cythonized/sage/structure/coerce_actions.c:6711)
return self.underlying_set()
File "sage/categories/action.pyx", line 186, in
sage.categories.action.Action.underlying_set
(build/cythonized/sage/categories/action.c:4087)
raise RuntimeError, "This action acted on a set that became
garbage collected"
RuntimeError: This action acted on a set that became garbage collected
**********************************************************************
File "src/sage/structure/coerce_actions.pyx", line 424, in
sage.structure.coerce_actions.ModuleAction.__invert__
Failed example:
A(x, 2)
Expected:
3*x
Got:
1/2*x
**********************************************************************
1 item had failures:
2 of 15 in sage.structure.coerce_actions.ModuleAction.__invert__
[90 tests, 2 failures, 0.47 s]
}}}
In all these doctests you need to hold domain/codomain explicitly alive.
--
Ticket URL: <http://trac.sagemath.org/ticket/17740#comment:29>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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