comparison mercurial/util.py @ 50396:82cf392c99f6 stable

re2: exit `_checkre2` early if calling it is useless

If we already know if re2 is supported there is no need to run the check again.
Stricly speaking we don't call it twice, but this seems a simple enough
safeguard to include in this series.

50395:e7a3611181aa

class _re:
    def _checkre2(self):
        global _re2
        global _re2_input

        check_pattern = br'\[([^\[]+)\]'
        check_input = b'[ui]'
        try:
            # check if match works, see issue3964

50396:82cf392c99f6

class _re:
    def _checkre2(self):
        global _re2
        global _re2_input
        if _re2 is not None:
            # we already have the answer
            return

        check_pattern = br'\[([^\[]+)\]'
        check_input = b'[ui]'
        try:
            # check if match works, see issue3964