#16250: Monoids._test_one() incorrect for unhashable one elements
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Reporter: saraedum | Owner:
Type: defect | Status: needs_work
Priority: trivial | Milestone: sage-6.3
Component: categories | Resolution:
Keywords: hash | Merged in:
Authors: Julian Rüth | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/saraedum/ticket/16250 | c4f8c62f8da90c776a32a86dd768c490fc50836a
Dependencies: | Stopgaps:
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Comment (by saraedum):
Replying to [comment:11 nthiery]:
> Replying to [comment:9 saraedum]:
> Now, if we would want a real fix we could have polynomial rings check
> whether there base ring elements can be hashed, and insert `__hash__ =
None`
> in their custom element class. This could get tricky for a
> Cython class though. But this states quite explicitly: I am hashable if
my
> base ring elements are.
Do you know if a Cython class can be marked as being unhashable?
`__hash__=None` does not work in Cython. (Maybe that's what you meant by
"This could get tricky for a Cython class though."?)
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Ticket URL: <http://trac.sagemath.org/ticket/16250#comment:14>
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