#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: Implement
Branch: | backtracking properly
u/SimonKing/ticket/15303 | Commit:
Dependencies: #14711 | 74821fe5409c3104b5d6eb7407a8287d54170df9
| Stopgaps:
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Comment (by SimonKing):
I think I have located the problem: If the pair `X,Y` already is
registered and we do `X.coerce_map_from(Y)`, then `None` should be
returned (but of course not cached). But currently it is still attempted
to find a coercion from `Y` to `X`, resulting in an infinite loop.
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Ticket URL: <http://trac.sagemath.org/ticket/15303#comment:51>
Sage <http://www.sagemath.org>
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