[issue9011] ast_for_factor unary minus optimization changes AST

[Antonio Cuni]

Antonio Cuni added the comment:

I would say that the complex-from-string constructor should be fixed to handle this special case "correctly".
I find very confusing that we get a different result whether we use a string literal or not.

For example, in pypy we use the same code for parsing literals and converting strings, so you get -0.0 in both cases.

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<http://bugs.python.org/issue9011>
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