[bug #61100] [troff] do_request(): assertion failed: 'do_old_compatible_flag == -1'

[Bjarni Ingi Gislason]

Follow-up Comment #1, bug #61100 (project groff):

  In ".do while ...", the "do" is valid for the whole loop.

  A simple example to cause a core dump is

.\".cp 1
.pl 20v
.do do nr a 1
.\".do do .nr a 1
\na



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