[Lilypond-auto] Issue 2728 in lilypond: count pairs of brackets

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Enhancement Frog

New issue 2728 by address@hidden: count pairs of brackets
http://code.google.com/p/lilypond/issues/detail?id=2728

A really common failure mode when writing .ly files is to omit a closing }  
somewhere.  Could we count all non-escaped { and }, and emit a specific  
error message if the numbers don't match, instead of giving the silly

Processing `foo.ly'
Parsing...
/home/gperciva/.usr/lilypond/usr/share/lilypond/current/ly/init.ly:35:0:  
error: syntax error, unexpected SCM_TOKEN

#(if (and (ly:get-option 'old-relative)
fatal error: failed files: "foo.ly"

message?  I think this is suitable for a Frog interested in the  
parser/lexer/that side of things.  I mean, computers are good at counting.