[issue9011] ast_for_factor unary minus optimization changes AST

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Added tests for Python 3.2's corrected treatment of negated imaginary literals in r82391, along with a Misc/NEWS entry indicating the changed behaviour.

Restored version numbers for this issue, which I seem to have accidentally deleted earlier.  (Including 3.1, since it could also benefit from the same cleanup.)

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versions: +Python 2.6, Python 2.7, Python 3.1

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