#20851: Potential infinite loop in src/sage/categories/coercion_methods.pyx
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Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: categories | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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This code from `src/sage/categories/coercion_methods.pyx` looks like a
potential infinite loop:
{{{
if have_same_parent_c(self, right) and hasattr(self, "_add_"):
return self._add_(right)
return coercion_model.bin_op(self, right, operator.add)
}}}
The `hasattr(self, "_add_")` clause is bad: if there is no `_add_`, the
coercion model will just call `__add__`, which calls the coercion model,
which calls `__add__`...
Solution: remove the `hasattr(self, "_add_")`.
Hopefully the whole module `coercion_methods.pyx` can be removed in #20767
and then the problem will disappear by itself.
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Ticket URL: <http://trac.sagemath.org/ticket/20851>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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