[Lilypond-auto] Issue 3954 in lilypond: Patch: Report bad return values in user-readable form

[lilypond]

Status: Started
Owner: address@hidden
Labels: Type-Enhancement Patch-new

New issue 3954 by address@hidden: Patch: Report bad return values in  
user-readable form
http://code.google.com/p/lilypond/issues/detail?id=3954

Report bad return values in user-readable form

An error message like

  markup-def.ly:11:20: error: music function cannot return
  (#<procedure line-markup (layout props args)> (Test))

is not really user-readable.  At the price of some possible ambiguity,
using a LilyPond syntax form like

  markup-def.ly:11:20: error: music function cannot return \markup \line {  
Test}

is quite preferable.

http://codereview.appspot.com/103460043

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