>
> 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
}}}
--
Alex Ghitza -- Lecturer in Mathematics -- The University of Melbourne
-- Australia -- http://www.ms.unimelb.edu.au/~aghitza/
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