LilyPond Internals Reference: 2.2.73 Merge_mmrest_numbers_engraver

### 2.2.73 Merge_mmrest_numbers_engraver

Engraver to merge multi-measure rest numbers in multiple voices.

This works by gathering all multi-measure rest numbers at a time step. If they all have the same text and there are at least two only the first one is retained and the others are hidden.

`Merge_mmrest_numbers_engraver` is part of the following context(s): DrumStaff, GregorianTranscriptionStaff, KievanStaff, MensuralStaff, PetrucciStaff, Staff, TabStaff and VaticanaStaff.

#### Internals Reference v2.22.2 (stable-branch).