On Apr 24, 2009, at 11:29 PM, Alex Ghitza wrote:
>
>>
>> Try calling canonical_coercion explicitly. What error is being
>> thrown!?
>>
>
> Right. Here goes:
>
> {{{
> sage: X = Spec(ZZ)
> sage: f = X.identity_morphism(); g = X.identity_morphism()
> sage: canonical_coercion(f, g)
> ERROR: An unexpected error occurred while tokenizing input
> The following traceback may be corrupted or invalid
> The error message is: ('EOF in multi-line statement', (980, 0))
>
> ----------------------------------------------------------------------
> -----
> RuntimeError Traceback (most recent
> call last)
>
> /home/ghitza/.sage/temp/artin/25555/_home_ghitza__sage_init_sage_0.py
> in <module>()
>
> /opt/sage-devel/local/lib/python2.5/site-packages/sage/structure/
> element.so
> in sage.structure.element.canonical_coercion
> (sage/structure/element.c:18992)()
>
> /opt/sage-devel/local/lib/python2.5/site-packages/sage/structure/
> element.so
> in sage.structure.element.canonical_coercion
> (sage/structure/element.c:18916)()
>
> /opt/sage-devel/local/lib/python2.5/site-packages/sage/structure/
> coerce.so
> in sage.structure.coerce.CoercionModel_cache_maps.canonical_coercion
> (sage/structure/coerce.c:7059)()
>
> RuntimeError: BUG in map, returned None Scheme endomorphism of
> Spectrum of Integer Ring
> Defn: Identity map <type 'sage.categories.morphism.CallMorphism'>
> Call morphism:
> From: Set of points of Spectrum of Integer Ring defined over
> Integer Ring
> To: Set of points of Spectrum of Integer Ring defined over
> Integer Ring
> }}}
Translation, if it's not clear. It got a coercion map f, tried to
call f(x), and f(x) returned None which is clearly a bug for whoever
implemented the morphism in question.
- Robert
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