[issue11549] Rewrite peephole to work on AST

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

While I would not be happy to use class X above, the 3.2 manual explicitly says "There are no implied relationships among the comparison operators. The truth of x==y does not imply that x!=y is false. " .

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