Merge_rests_engraver appears to not be working in 2.18 nor 2.19

[Grant Diffey]

Hi,

I've copied the example code from
http://lilypond.org/doc/v2.19/Documentation/notation/multiple-voices#merging-rests
and
pasted it into lilybin at: http://lilybin.com/v13cxt/1 and then tested with
2.18 and 2.19 the results mirror my local result with 2.18,2 on debian

Starting lilypond 2.18.2 [Untitled]...

Processing `/tmp/frescobaldi-_erjhv5d/tmpmvwdg8ci/document.ly'

Parsing...

/tmp/frescobaldi-_erjhv5d/tmpmvwdg8ci/document.ly:1 <0>: warning: no
\version statement found, please add


\version "2.18.2"


for future compatibility

Interpreting music...

warning: unknown translator: `Merge_rests_engraver'

warning: cannot find: `Merge_rests_engraver'

Preprocessing graphical objects...

Finding the ideal number of pages...

Fitting music on 1 page...

Drawing systems...

Layout output to `document.ps'...

Converting to `./document.pdf'...

Success: compilation successfully completed

Completed successfully in 0.9".


Rests are not combined in the output. The regression test at:
http://lilypond.org/doc/v2.19/input/regression/collated-files.html

also seems to have problems from bar 13 onward


Grant.