del transaction before lock before wlock This way rollbacks happen while the repo is still locked. Deleting lock before wlock is not strictly necessary, but is more consistent with the locking order.

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#!/bin/sh

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hg init

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python -c 'print "confuse str.splitlines\nembedded\rnewline"' > a

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hg ci -Ama -d '1 0'

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echo clean diff >> a

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hg ci -mb -d '2 0'

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hg diff -r0 -r1