view .clang-format @ 46417:768056549737

errors: use exit code 40 for when a hook fails

A hook can be used for checking inputs, state, configuration,
security, etc., so it's unclear which of the existing exit codes to
use. Let's instead add one specifically for failed hooks. I picked 40.

Differential Revision: https://phab.mercurial-scm.org/D9910

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