LilyPond Internals Reference: 2.2.100 Rest_collision_engraver

### 2.2.100 Rest_collision_engraver

Handle collisions of rests.

Properties (read)

> `busyGrobs` (list)

>   A queue of `(end-moment . grob)` cons cells. This is for internal (C++) use only. This property contains the grobs which are still busy (e.g. note heads, spanners, etc.).

This engraver creates the following layout object(s):

RestCollision.

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

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