Alain Kalker <a.c.kalker@gmail.com> writes:

> In a buffer editing a Makefile, marking a line in a recipe then doing
> C-c C-c should put a "#" at the beginning of the line (before the
> <tab>).  Instead, it puts "# " before the command, which doesn't make a
> valid Makefile comment, i.e. it gets sent to the shell. In particular,
> expansions like $(definedvar) get executed, which is usually not what is
> wanted.

(This bug report unfortunately got no response at the time.)

I tried reproducing this bug in Emacs 28 with this Makefile snippet: