Updates:
Labels: Patch-new
Comment #1 on issue 1902 by d...@gnu.org: scheme engravers cause "warning:
Attempting to remove nonexisting listener."
http://code.google.com/p/lilypond/issues/detail?id=1902#c1
Issue 1902: scheme engravers cause "warning: Attempting to remove
nonexisting listener."
Implements listener equality compatible with instanced Scheme engravers.
http://codereview.appspot.com/5676103
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