On Apr 25, 2009, at 12:40 AM, Alex Ghitza wrote:
>
>>
>> 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.
>>
>
> That helped me track it down to
>
> {{{
> sage: X = Spec(ZZ)
> sage: H = Homset(X, X)
> sage: H(X.identity_morphism())
> }}}
>
> Note the absence of output from the last command -- that's the None
> that's creating all the trouble. OK, I think I can fix this now.
Good.
BTW, there's a ticket up to make this kind of stuff easier to debug:
http://sagetrac.org/sage_trac/ticket/5596
- Robert
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