Fix possible file corruptions via fmt hook#35
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rustfmt should not be called on multiple files, since it can update included files as well, which will lead to writing different files without a lock, and inevitably will corrupt them.
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The problem is that rustfmt called on multiple files, while this will lead to concurrent file modifications, see [1]. [1]: doublify/pre-commit-rust#35
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rustfmt should not be called on multiple files, since it can update included files as well, which will lead to writing different files without a lock, and inevitably will corrupt them.