Re: Issue 1338 in lilypond: Setting spacing alist key individually breaks annotate-spacing

[lilypond]

Updates:
        Status: Started
        Owner: n.puttock
        Labels: -Type-Other Type-Defect Priority-High

Comment #1 on issue 1338 by n.puttock: Setting spacing alist key  
individually breaks annotate-spacing
http://code.google.com/p/lilypond/issues/detail?id=1338

This is quite serious, since it means any individual setting resets the  
existing alist values to their C++ defaults.

The old setting of the alist should be dereferenced via scm_varibale_ref:  
as the error message shows above, it's anonymous until eval'd in the  
current module.