[bug #68420] Using .cc ' causes Assertion failed: (assignment_worked), function assign_control_character_request

Update of bug #68420 (group groff):

                Severity:              3 - Normal => 4 - Important

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Follow-up Comment #1:

[comment #0 original submission:]
> I don't know if this is sensible input,

Input can be utter nonsense and there still shouldn't be an assertion failure.
 This means the code is following a path the developers thought impossible.

I can replicate your results, using an even more minimal example.  I see the
failure in 1.24.0, and, as you report, not in 1.23.

$ groff <<END
.cc '
'cc
END
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




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