#12990: Add another doctest to connecting conversion maps
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Reporter: lftabera | Owner:
robertwb
Type: defect | Status:
needs_review
Priority: major | Milestone:
sage-5.1
Component: coercion | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Keshav Kini
Authors: Simon King, Luis Felipe Tabera Alonso | Merged in:
Dependencies: | Stopgaps:
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Changes (by lftabera):
* status: needs_info => needs_review
Old description:
> We currently have this error
>
> {{{
> K = NumberField([x^2-2, x^2-3], 'a,b')
> M = K.absolute_field('c')
> M_to_K, K_to_M = M.structure()
> M.register_coercion(K_to_M)
> K.register_coercion(M_to_K)
> M.coerce_map_from(QQ)
> ...
> UnboundLocalError: local variable 'connecting' referenced before
> assignment
> }}}
>
> This error was not present in 4.7.x series
New description:
between 4.7.x and 5.x series, the following error was introduced:
{{{
K = NumberField([x^2-2, x^2-3], 'a,b')
M = K.absolute_field('c')
M_to_K, K_to_M = M.structure()
M.register_coercion(K_to_M)
K.register_coercion(M_to_K)
M.coerce_map_from(QQ)
...
UnboundLocalError: local variable 'connecting' referenced before
assignment
}}}
This error was fixed in #12919. We propose to add a new test to that fix.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12990#comment:10>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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