[issue2877] Backport UserString move from 3.0

[Quentin Gallet-Gilles]

Quentin Gallet-Gilles <qgallet at gmail.com> added the comment:

Attaching a patch for the deprecation warning in 2.6 of the
MutableString class. The import fixer for 2to3 is coming next.

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keywords: +patch
Added file: http://bugs.python.org/file10454/userstring_2.6.patch

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