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