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ltxdoc class triggers pipe verb delimiter
================================================================================
\documentclass{ltxdoc}
|foo|
--------------------------------------------------------------------------------
(document
  (use
    (cs)
    (group (l) (name) (r)))
  (short_verb (verb_delim) (verbatim) (verb_delim)))

================================================================================
ltxdoc class triggers pipe verb delimiter via char ref
================================================================================
\documentclass{^^,^^4xdoc}
|foo|
--------------------------------------------------------------------------------
(document
  (use
    (cs)
    (group (l) (name) (r)))
  (short_verb (verb_delim) (verbatim) (verb_delim)))