[issue2112] mmap.error should be a subclass of EnvironmentError and not a direct EnvironmentError

[John Lenton]

John Lenton added the comment:

Ran the regression test with this patch, all ok (on Ubuntu Gutsy).
Attached diff is the same, with the addition of the NEWS entry.

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nosy: +Chipaca
Added file: http://bugs.python.org/file9443/mmap3.diff

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