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Bison in 3.8.2 added new warnings to catch m4 strings accidentally included in the generated code output. It had the unfortunate side effect of flagging grammars that include "m4_foo" style strings as identifiers in their grammar (which we do). Based on the thread, it looks like a fix was implemented on the Bison side, but as of three years later, no release has been made. Bison seems to possibly have maintainer inactivity: akimd/bison#103.
Since a fix for the false positive is not forthcoming, disable the warning. Unfortunately, I don't think a more granular disablement is available, but IMO false positive warnings are worse than false negatives.