Trap OSError when deleting env vars On the other OS, it seems that case insensitivity for environment vars can bite users when using some unknown combination of python 2.4.1 and win2kSP4+minsys (and probably other vversions of these softwares). The best way to avoid problems in those weird cases is to ignore OSError exception during env var deletion.

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+ hg init

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+ hg add a

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+ hg commit -m commit #0 -d 0 0

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+ hg add b

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+ hg commit -A -mcomment #1 -d 0 0

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removing b

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b never committed!

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nothing changed