[bug #64616] [troff] warn when \e used in interpretation mode?

[G. Branden Robinson]

Update of bug #64616 (project groff):

                  Status:                    None => Need Info              
             Assigned to:                    None => gbranden               
                 Summary: [troff] should warn when \a, \e, \t used in
interpretation mode => [troff] warn when \e used in interpretation mode?

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Follow-up Comment #1:

I have to scratch `\a` and `\t` from that list already.

Diversions are not read in copy mode (at least in one of their trips through
the formatter), yet they may encounter uninterpreted 
leaders and tabs.

The _me_(7) macro package exercises this behavior and "meintro.me" illustrates
it.

https://git.savannah.gnu.org/cgit/groff.git/tree/doc/meintro.me.in?h=1.23.0#n1055

(Look for the `xp` call.)

There's some fairly hairy stuff in the package's `)x` macro.

https://git.savannah.gnu.org/cgit/groff.git/tree/tmac/e.tmac?h=1.23.0#n1769

So that just leaves poor little \e.


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