Issue 535 in lilypond: ly:stem::pure-height (expecting real number)

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Issue 535: ly:stem::pure-height  (expecting real number)
http://code.google.com/p/lilypond/issues/detail?id=535

New issue report by gpermus:
% reported by Nicolas Sceaux, so I assume it's a real scheme problem
% and not a user who doesn't know how to do scheme.  :)

The following snippet causes an error with LilyPond 2.11.36:

{
  \stemUp r8
  \override Voice.Stem #'details #'lengths = #'(3.0)
  c'8 ~
  \revert Voice.Stem #'details #'lengths
  c'4
}

==>
ERROR: In procedure ly:stem::pure-height:
ERROR: Wrong type (expecting real number): (beamed-lengths 3.26 3.5 3.6)


Issue attributes:
        Status: Accepted
        Owner: gpermus
        Labels: Type-Defect Priority-Medium

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