- **Needs**:  -->  
- **Patch**: new --> needs_work
- **Type**:  --> Enhancement
- **Comment**:

Fails make check.

.../regression/merge-rests-engraver.ly

~~~
Processing `./e0/lily-cbbf11e5.ly'
Parsing...
Renaming input to: 
`/home/james/lilypond-git/input/regression/merge-rests-engraver.ly'
Interpreting music...Backtrace:
In /home/james/lilypond-git/build/out/share/lilypond/current/scm/lily.scm:
1025:  1* (let* ((failed #)) (if (ly:get-option #) (begin #)) ...)
1025:  2* [lilypond-all #]
1038:  3  (let* ((failed #) (separate-logs #) (ping-log #) ...) (gc) ...)
1050:  4* [for-each #<procedure #f #> #]
In unknown file:
   ?:  5* [#<procedure #f (x)> "e0/lily-cbbf11e5.ly"]
In /home/james/lilypond-git/build/out/share/lilypond/current/scm/lily.scm:
1052:  6* (let* (# # #) (if separate-logs #) (if ping-log #) ...)
1063:  7* [lilypond-file #<procedure #f (key failed-file)> 
"e0/lily-cbbf11e5.ly"]
1098:  8  [catch ly-file-failed #<procedure #f ()> #<procedure #f (x . args)>]
In unknown file:
   ?:  9* [#<procedure #f ()>]
In /home/james/lilypond-git/build/out/share/lilypond/current/scm/lily.scm:
1099: 10* [ly:parse-file "e0/lily-cbbf11e5.ly"]
In /home/james/lilypond-git/build/out/share/lilypond/current/ly/init.ly:
  56: 11* (let* ((book-handler #)) (cond (# #) (# #)))
  59: 12  (cond (# #) (# #))
In 
/home/james/lilypond-git/build/out/share/lilypond/current/scm/lily-library.scm:
    ...
 243: 13  [ly:book-process-to-systems #<Book> #< Output_def> ...]
In unknown file:
   ?: 14* [# #]
   ?: 15* [# # #]
   ?: 16* [# #]
   ?: 17* [# # #]
   ?: 18* [Merge_rests_engraver #<Context Staff () >]
   ?: 19* (letrec (# # # # ...) (let # #))
In 
/home/james/lilypond-git/build/out/share/lilypond/current/scm/scheme-engravers.scm:
 157: 20* (rest-eqv (quote measure-count))

/home/james/lilypond-git/build/out/share/lilypond/current/scm/scheme-engravers.scm:157:30:
 In express
ion (rest-eqv (quote measure-count)):
/home/james/lilypond-git/build/out/share/lilypond/current/scm/scheme-engravers.scm:157:30:
 Variable u
sed before given a value: rest-eqv

~~~





---

** [issues:#1228] merge simultaneous rests of the same duration**

**Status:** Started
**Created:** Wed Aug 18, 2010 11:15 AM UTC by Anonymous
**Last Updated:** Sat May 20, 2017 06:04 AM UTC
**Owner:** horndude77


*Originally created by:* *anonymous

*Originally created by:* 
[[email protected]](http://code.google.com/u/106131861630194758622/)

On 11 June 2010 16:27, Xavier Scheuer <[email protected]> wrote:

Could you implement the possibility:
 \override RestCollision \#'positioning-done = \#merge-rests-on-positioning
described in 
[http://lsr.dsi.unimi.it/LSR/Item?id=336](http://lsr.dsi.unimi.it/LSR/Item?id=336)
\_directly\_ into LilyPond?
So we would not have to define  merge-rests-on-positioning  ourselves,
each time we want to use this function.
This function \_is useful\_, as shown by the several messages asking for
this on lilypond-user:
[http://lists.gnu.org/archive/cgi-bin/namazu.cgi?query=Merging+rests+&submit=Search!&idxname=lilypond-user](http://lists.gnu.org/archive/cgi-bin/namazu.cgi?query=Merging+rests+&submit=Search!&idxname=lilypond-user)
That would also be great if you could overpass the limitations, i.e.
 – ability to handle more than two voices ;
>– handle multi-measure/whole-measure rests.

Maybe the following discussion could be helpful in a certain way:
[http://lists.gnu.org/archive/html/lilypond-user/2010-02/msg00452.html](http://lists.gnu.org/archive/html/lilypond-user/2010-02/msg00452.html)


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