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The Fortran userdiff patterns, introduced in 909a5494f8 (userdiff.c: add
builtin fortran regex patterns, 2010-09-10), predate the test
infrastructure for xfuncname patterns, introduced in bfa7d01413 (t4018:
an infrastructure to test hunk headers, 2014-03-21).
Add tests for the Fortran xfuncname patterns. The test
't/t4018/fortran-comment-keyword' documents a shortcoming of the regex
that is fixed in a subsequent commit.
While at it, add descriptive comments for the different parts of the
regex.
Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Philippe Blain