[bug #63470] [troff] ramifications of `chop` not fully illuminated

[G. Branden Robinson]

Update of bug#63470 (group groff):

              Item Group:     Incorrect behaviour => Documentation          
                 Summary: [troff] `nop` and output line continuation `\c`
interact magically => [troff] ramifications of `chop` not fully illuminated

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Follow-up Comment #1:

The answer is that *roff is a macro language, not a procedural one.

If you chop the final newline from a diversion and then emit it, then in its
interpolation context *there is no final newline*.

So the next thing in the input stream that is interpreted is processed in
whatever the context established by the diversion was.
Usually, this will be a text line.


$ cat EXPERIMENTS/magic-diversion.groff
.di foo
This is my diversion.
.br
.di
.foo
.nop How do you like it?
.chop foo
.foo
.nop Does it suit?
.pl \n[nl]u
$ nroff EXPERIMENTS/magic-diversion.groff
This is my diversion.   How   do   you   like   it?    This is my
diversion..nop Does it suit?


If this stumped me, it may stump others.  Discuss it more in our Texinfo
manual, and possibly alongside the `chop` request in the _groff_(7) and/or
_groff_diff_(7) man pages.


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