[bug #68420] [troff] assertion failure in `assign_control_character_request()` when issuing `.cc '` then `'cc` control lines

[G. Branden Robinson]

Follow-up Comment #4, bug #68420 (group groff):

This raises an assertion failure too.


$ echo ".c2 ." | groff
troff:<standard input>:1: error: ignoring no-break control character change
request; the (breaking) control character is already '.'
troff: ../src/roff/troff/input.cpp:341: void
assign_no_break_control_character_request(): Assertion `assignment_worked'
failed.
groff: error: troff: Aborted (core dumped)


In both cases the error diagnostics are legitimate and accurate.


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