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Surprisingly, every escape sequence can also be used as an argument
delimiter for an outer escape sequence, in which case the delimiting
escape sequence retains its syntax but usually ignores its argument
and loses its inherent effect.  Add rudimentary support for this
syntax quirk in order to improve parsing compatibility with groff.

ESC-O(1)                    General Commands Manual                   ESC-O(1)

NNAAMMEE
     eesscc--oo - the roff escape o sequence: overstrike

DDEESSCCRRIIPPTTIIOONN
     empty: xx
     one character: x|x
     wide/narrow: xO|x
     narrow/wide: x|Ox
     wide/narrow/narrow: xO-|x
     narrow/narrow/wide: x|-Ox

   AArrgguummeenntt ddeelliimmiitteerrss
     unsupported \r: xyu
     ignored \&: xyu
     useless \.: xyu
     invalid \G: xyu
     special \-: xyu
     break \p: xyu
     nospace \c: xyu
     string expansion: xyu
     register expansion: 23u
     ignored \ON: xyu
     special character: xyu
     ignored \Z'str': xyu
     horizontal motion: xyu
     horizontal line: xyu
     overstrike: xyu
     unterminated: xy

OpenBSD                          June 8, 2022                          OpenBSD