Follow-up Comment #1, bug #67785 (group groff): [comment #0 original submission:] > Issue dates back to _groff_ 1.22.3 at least.
1.19.2 at least.
$ groff --version | head -1
GNU groff version 1.19.2
$ printf '.nr a\\%% 42\n' | groff -zww
<standard input>:1: `\%' is not allowed in a name
<standard input>:1: warning: numeric expression expected (got `\%')
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