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

[G. Branden Robinson]

Follow-up Comment #3, bug #68420 (group groff):

Moar minimal:


$ echo ".cc '" | groff
troff:<standard input>:1: error: ignoring control character change request;
the no-break control character is already "'"
troff: ../src/roff/troff/input.cpp:298: void
assign_control_character_request(): Assertion `assignment_worked' failed.
groff: error: troff: Aborted (core dumped)




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