[bug #64101] improve diagnostic for bad string argument

[G. Branden Robinson]

Follow-up Comment #1, bug #64101 (project groff):

I just ran into the same diagnostic!  We may be poking our fingers into
similar things.

But in my case, I got it on legitimate input.

I'll file a separate bug for the incorrect diagnosis (rather than the wording)
but wanted to record it here as well.


$ cat ATTIC/defchar.groff
.char \[BS] BELL LABS
.ds mystr ABC\[BS]
.nf
\[rs][BS] -> \[BS]
mystr -> \*[mystr]
.chop mystr
mystr -> \*[mystr]
.pl \n[nl]u
$ ./build/test-groff -Tascii ATTIC/defchar.groff
troff:ATTIC/defchar.groff:7: error: a newline character is not allowed in an
escape sequence parameter
\[BS] -> BELL LABS
mystr -> ABCBELL LABS
mystr -> ABC


This problem is not new to groff 1.23.0; it's in 1.22.4, with old language.


$ nroff ATTIC/defchar.groff
troff: ATTIC/defchar.groff:7: a newline character is not allowed in an escape
name
\[BS] ‐> BELL LABS
mystr ‐> ABCBELL LABS
mystr ‐> ABC




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