Issue 1881 in lilypond: Multiple cyclic dependency errors for Beam/Stem

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Critical

New issue 1881 by address@hidden: Multiple cyclic dependency errors  
for Beam/Stem
http://code.google.com/p/lilypond/issues/detail?id=1881

Following commit 6465274e66a851cccd4cd32a521abc853f3e79dd, `Restores stem  
length and stem-begin-position.', even the simplest snippets with beaming  
spit out multiple cyclic dependency errors:

\version "2.15.12"

\relative c' {
  c8 d e f
}


/tmp/tmpcPppzK/document.ly:2:2: programming error: cyclic dependency:  
calculation-in-progress encountered for #'Y-extent (Stem)

  c8 d e f
/tmp/tmpcPppzK/document.ly:2:2: continuing, cross fingers


  c8 d e f
/tmp/tmpcPppzK/document.ly:2:2: programming error: cyclic dependency:  
calculation-in-progress encountered for #'quantized-positions (Beam)

  c8 d e f
/tmp/tmpcPppzK/document.ly:2:2: continuing, cross fingers


  c8 d e f
/tmp/tmpcPppzK/document.ly:2:2: programming error: cyclic dependency:  
calculation-in-progress encountered for #'quantized-positions (Beam)

  c8 d e f
/tmp/tmpcPppzK/document.ly:2:2: continuing, cross fingers


  c8 d e f
/tmp/tmpcPppzK/document.ly:2:2: programming error: cyclic dependency:  
calculation-in-progress encountered for #'quantized-positions (Beam)

  c8 d e f
/tmp/tmpcPppzK/document.ly:2:2: continuing, cross fingers


  c8 d e f

This is a serious problem for regression testing, since it obscures genuine  
changes.