Updates: Labels: NeedsReview Comment #5 on issue 3214 by asmeu...@gmail.com: KeyError with radsimp() http://code.google.com/p/sympy/issues/detail?id=3214
Regarding the xreplace solution, I'm not convinced that that will always work. It should work if the place where the match keys are used is mathematically equivalent to the match expression (as it is in this case), so that the missing keys just disappear.
But anyway, I think issue 1577 *is* this issue, so let's move the discussion about that to there.
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