New in version 2.3.
True when expr is a component with instrument mark attached:
abjad> staff = Staff("c'8 d'8 e'8 f'8")
abjad> violin = contexttools.InstrumentMark('Violin ', 'Vn. ')
abjad> violin.attach(staff)
InstrumentMark(instrument_name='Violin ', short_instrument_name='Vn. ')(Staff{4})
abjad> f(staff)
\new Staff {
\set Staff.instrumentName = \markup { Violin }
\set Staff.shortInstrumentName = \markup { Vn. }
c'8
d'8
e'8
f'8
}
abjad> contexttools.is_component_with_instrument_mark_attached(staff)
True
Otherwise false:
abjad> contexttools.is_component_with_instrument_mark_attached(staff[0])
False
Return boolean.