rlamy/sympy — pull request #2 by smichr (2012-03-11 11:13:52+00:00)
Title: Fix for XFAILED solve test

If a CoercionError is raised when trying to solve a system of
equations, a NotImplementedError is raised so that the equations
get added to the failed equations.

The failed equations are now sorted to make the manual solving
process more canonical. Ties are broken by count_op length and
then by the default_sort_key.

The condition that eq2.is_number be True was removed since
an expression might be a symbolic zero. (A test failed without
this change after making the canonical change.)