[bug #65930] [me] large values of register `tv` cause infinite trap recursion

[Dave]

Follow-up Comment #7, bug #65930 (group groff):

OK.  So.

The patch has no effect on my original test file.  Test fails with it, fails
without it.

Your updated test file (from comment #2) does not generate the error under any
circumstances for me.  Not with patched -me, not with unpatched, not with a
stock 1.22.4.

$ cat tv-stack-limit.me
.nr $v 1640u
.fo 'foo'bar'baz'
.lp
You get the diplomatic treatment
.br
You get the force-fed future
.br
You get the funk after death
.br
You get the weisenheimer brainstorm
$ groff --version | head -1
GNU groff version 1.22.4
$ groff -me tv-stack-limit.me | wc
    249     705    6268
$ groff -Tascii -me tv-stack-limit.me | uniq -c
     20 
      1 You get the diplomatic treatment
     13 
      1 You get the force-fed future
     13 
      1 You get the funk after death
     13 
      1 foo                          bar                         baz
     23 
      1 You get the weisenheimer brainstorm
     41 
      1 foo                          bar                         baz
      3 




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