Follow-up Comment #20, bug #66392 (group groff): Fun fact: not all emptiness is equivalent.
$ cat hla_strings
.ev 1
.if '\?\n[.hla]\?'' .tm hla is undefined
.if '\?\n[.hla]\?'\?\?' .tm hla is REALLY undefined
$ groff-latest hla_strings
hla is REALLY undefined
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