Follow-up Comment #2, bug #66675 (group groff): [comment #1 comment #1:] > \[u...] means an unicode character.
It was permitted to mean other things for the past at least 20 years and I bet
a lot longer.
$ nroff --version
GNU nroff (groff) version 1.19.2
$ printf '.char \[unhappy] :-(\nI feel \[unhappy] today.\n' | nroff | cat -s
I feel :‐( today.
If this is an intentionally breaking change (a la bug #66673), it needs to be
documented as such.
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