M4 "dnl" command works essentially like a comment (apart that it isn't printed at all).
While M4 does not necessarily embed Shell, it is most common use nowadays is in Autoconf that does embed Shell, so having support for this in LexBash makes sense (to me).
Joined is a patch that implements this. Maybe it should have a lexer property to enable/disable the feature, but unfortunately I didn't find how to add properties to this lexer.
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