Subsume all measures in expr containing only top-level tuplet. Measures usually become nonbinary as as result of subsumption.
Return None.
Example:
abjad> t = RigidMeasure((2, 8), [
FixedDurationTuplet((2, 8), construct.scale(3))])
abjad> measuretools.subsume(t)
abjad> print t.format
\time 3/12
\scaleDurations #'(2 . 3) {
c'8
d'8
e'8
}