#7420: Fix uncaught infinite loop in coercion discovery
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Reporter: nthiery | Owner: mhansen
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.2.1
Component: coercion | Keywords: coercion
Work_issues: | Author: Mike Hansen
Reviewer: Nicolas M. Thiéry, Robert Bradshaw | Merged:
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#5597 or #5598 introduced a potential infinite loop (and segfault) upon
coercion discovery on a cyclic graph. The first occurence of such a graph
was with the newly refactored symmetric functions.
The attached patch fixes this. By the way, it uses a dictionary rather
than a list to hold the marks used (register_pair) to detect cycles.
The category patches #5981 depend on this!!!
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7420>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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