#15303: Coercion discovery fails to be transitive
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Reporter: nbruin | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.13
Component: coercion | Resolution:
Keywords: | Merged in:
Authors: Simon King | Reviewers:
Report Upstream: N/A | Work issues: Crash in permgroup.py
Branch: | Commit:
u/SimonKing/ticket/15303 | 807550bbc45e9872ac365fc98b817ccd5bcfbb95
Dependencies: #14711, #15329, | Stopgaps:
#15331 |
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Comment (by SimonKing):
If I understand correctly, the crash occurs while computing the hash of a
`sage.groups.libgap_wrapper.ElementLibGAP` object.
The hash is inherited from `sage.structure.element.Element` and relies on
the string representation. The string representation relies on the result
of the `is_one` method. This, in turn, amounts to comparison with
`self.parent().one()`.
Now I wonder: Has self become defunct? Or has `self.parent().one()` become
defunct? Is it (again) the `WeakValueDictionary` used by
`CachedRepresentation` that is causing the trouble?
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Ticket URL: <http://trac.sagemath.org/ticket/15303#comment:95>
Sage <http://www.sagemath.org>
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