[issue2877] Backport UserString move from 3.0

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

r63767 has the 2.6 changes (with the block in 3.0 in r63768). r63769 has 
the fixer in 2to3 in the sandbox.

Thanks for the patches, Quentin.

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resolution:  -> accepted
status: open -> closed

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