Follow-up Comment #9, bug #62264 (group groff): I'm not sure how a reverse iterator is supposed to work with compatibility mode save and restore tokens. An `rfor` request seems to me, at this time, to be dangerous.
One could still achieve results like _basename_(1) with a forward iterator.
Sketch:
.\" Store "basename" of $1 in string named $2.
.de basename
. ds tmp \" empty
. for ch \\$1 \{\
. ie '\\*[ch]'/' .ds tmp \" empty
. el .as tmp \\*[ch]
. \}
. ds \\$2 \\*[tmp]
. rm tmp
..
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