#15223: Let the `TestSuite` test that the construction of a parent returns the
parent
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Reporter: SimonKing | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.1
Component: coercion | Resolution:
Keywords: construction | Merged in:
functor, test suite, sd53 | Reviewers:
Authors: Simon King | Work issues: algebraic extension
Report Upstream: N/A | functor for residue fields
Branch: | Commit:
u/SimonKing/ticket/15223 | b23f18d716915ae30283cd90da74f865067f72fe
Dependencies: #15229 | Stopgaps:
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Comment (by SimonKing):
With the new commit, the construction of field extensions is fixed.
Problem was: Finite fields may have different implementations (givaro,
pari_ffelt, ...), but this was ignored in the construction of the
construction functor. Now, the implementation is tracked in the
construction functor.
One complication: When we merge the construction functors, we need to
choose among the implementations. I decided (for now) to always rely on
the ''default'' implementation upon merging.
__Rationale__
- The situation is not worse than before. Without the latest commit,
applying the construction functor of a finite field would ''always'' use
the default implementation. With the latest commit, applying the
construction functor of a finite field F will use the implementation that
was used for F. Only if a new construction functor is created by merging
two functors (which may happen in the pushout construction), the default
implementation will be used,
- We can't rely on a custom implementation in the merged functor, since a
custom implementation may not be available for a non-prime field, that
could be the result of merging.
--
Ticket URL: <http://trac.sagemath.org/ticket/15223#comment:45>
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