[issue2339] Backport intern() -> sys.intern()

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

Here's a patch which moves intern to sysmodule.c, adds a Py3k warning,
updates the docs, and moves the tests.

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keywords: +patch
nosy: +benjamin.peterson
Added file: http://bugs.python.org/file9698/backport_sys_intern.patch

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