[issue11549] Build-out an AST optimizer, moving some functionality out of the peephole optimizer

[Eugene Toder]

Eugene Toder added the comment:

If I'm not missing something, changing
x in [1,2]
to
x in (1,2)
and
x in {1,2}
to
x in frozenset([1,2])
does not change any error messages.

Agreed that without dynamic compilation we can pretty much only track literals (including functions and lambdas) assigned to local variables.

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<http://bugs.python.org/issue11549>
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