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

NNAAMMEE
     eesscc--ll - the roff escape l sequence: horizontal line

DDEESSCCRRIIPPTTIIOONN
     explicit scaling unit and fill char: >ff<
     explicit scaling unit and default char: >___<
     default unit and explicit fill char: >xxxx<
     default unit and char: >_____<
     explicit scaling unit and escape sequence: >+-+-+-<
     default unit and escape char: >@@@@@@@<
     rounding: >xxx<

   AArrgguummeenntt ddeelliimmiitteerrss
     invalid ASCII: ><
     unsupported \!: __u
     unsupported \r: 2u
     ignored \%: __u
     ignored \&: xxu
     ignored \): xxu
     ignored \,: 2u
     ignored \/: __u
     ignored \^: 2u
     ignored \a: 2u
     ignored \d: 2u
     ignored \t: 2u
     ignored \u: 2u
     ignored \{: __u
     ignored \|: 2u
     ignored \}: __u
     useless \.: 2.u
     invalid \G: __u
     special \ : 2 u
     special \': xxu
     special \-: xxu
     special \0: 2 u
     special \:: __u
     special \_: __u
     special \`: xxu
     special \e: xxu
     special \~: 2 u
     break \p: __u
     nospace \c: __u
     string expansion: __u
     register expansion: 21u
     ignored \O: 2u
     ignored \Y: 2u
     ignored \k: __u
     special character: xxu
     ignored \D: 2u
     ignored \L: 2u
     ignored \X: 2u
     ignored \Z: 2u
     ignored \b: 2u
     ignored \v: 2u
     ignored \x: 2u
     horizontal motion: 2   u
     horizontal line: 2___u
     overstrike: 2cdu

OpenBSD                          June 8, 2022                          OpenBSD