@c- is not treated as a comment

[Karl Berry]

Running makeinfo on the input file:

\input texinfo
@setfilename cdash.info
@c-
@bye

gets
/tmp/x.tex:3: Unknown command `c-'.

Same for @comment-.

C makeinfo does the same.  But it doesn't seem right to me.  I don't see
anything in the manual that says that @c or @comment have to be followed
by a space.  (texinfo.tex treats the above as a comment.)  Did we
discuss this already?  I don't remember.

Seems like if @c or @comment is followed by anything except another
letter, that is [a-zA-z], it should be considered the comment command.

Wdyt?

Thanks,
K