New in version 2.3.
True when expr is component with LilyPond comment mark attached:
abjad> note = Note("c'4")
abjad> marktools.LilyPondComment('comment here')(note)
LilyPondComment('comment here')(c'4)
abjad> marktools.is_component_with_lilypond_comment_attached(note)
True
False otherwise:
abjad> note = Note("c'4")
abjad> marktools.is_component_with_lilypond_comment_attached(note)
False
Return boolean.