#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: analyse recursion
Branch: | error
u/SimonKing/ticket/15303 | Commit:
Dependencies: #14711 | f837cbee8f81c4946a92193c73e86449c53515d9
| Stopgaps:
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Comment (by SimonKing):
The example of `QQbar.coerce_map_from(ZZ)` fails as follows.
We want that the coercion is determined by `QQbar._coerce_map_from_(ZZ)`
(which returns True). But apparently (with my current patch, at least),
the backtracking has preference over what is returned by
`_coerce_map_from_`. I don't understand the reason, yet.
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Ticket URL: <http://trac.sagemath.org/ticket/15303#comment:23>
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