Bogus Bison 3.8.2 warning: suspicious sequence in the output

Hi,

Bison 3.8.2 is issuing the following warning for a grammar whose
semantic action includes the variable name my_charset_utf8mb4_bin:

yy_mariadb.cc:35834: warning: suspicious sequence in the output:
b4_bin [-Wother]

It seems to me that the regular expression in
http://git.savannah.gnu.org/cgit/bison.git/tree/src/scan-skel.l is too
greedy. Perhaps a start-of-word anchor like \< (if flex supports that)
could be applied? Even then, I suppose that it would create bogus
warnings if the input actually contains any word that starts with m4_
or b4_. (Are those documented as reserved words?)

With best regards,

Marko
-- 
Marko Mäkelä, Lead Developer InnoDB
MariaDB Corporation