> This sequence produces a mystery diagnostic that I suppose refers to
> the name of a nonterminal symbol in some unpublish BNF:
>
> \s\d
>
> The diagnostic is "cannot use a node as a starting delimiter"
Hmm. If you say
info groff
and type
i node
to get to an indexed entry for `node', you come to section `gtroff
internals' in groff's info file, explaining what a node is.
If you still don't like the warning message, can you suggest something
better? Note that the list of possible delimiters is quite long and
contains a lot of surprises, cf. section `Escapes' in the info manual.
Werner
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