\set beatLength broken?

[Damian leGassick]

hi all

the snippet given at

http://lilypond.org/doc/v2.13/Documentation/notation/beams

\relative c'' {
  c32[ c c c c c c c]
  \set subdivideBeams = ##t
  c32[ c c c c c c c]

  % Set beam sub-group length to an eighth note
  \set baseMoment = #(ly:make-moment 1 8)
  \set beatStructure = #'(2 2 2 2)
  c32[ c c c c c c c]

  % Set beam sub-group length to a sixteenth note
  \set baseMoment = #(ly:make-moment 1 16)
  \set beatStructure = #'(4 4 4 4)
  c32[ c c c c c c c]
}

does not work for me under 2.13.55

I get a warning 

cannot find property type-check for 'beatLength' (translation-type?).

or am I doing something wrong

cheers

Damian