Programming errors

[David Feuer]

When I tried turning beams upside down I got a series of errors from Lilypond:

>snip<
Calculating line breaks... 
programming error: Grob direction requested while calculation in progress. 
continuing, cross fingers
programming error: Grob direction requested while calculation in progress. 
continuing, cross fingers

... (the same error repeats many times)

[3][6][9][12][15][18][21][24][25]
Calculating page breaks...
Layout output to `Minuet-Bach-LM41a.ps'...

The input file:

\version "2.8.0"
\include "english.ly"
%mBreak={\break}
 mBreak = { }
#(ly:set-option 'point-and-click #f)
#(set-global-staff-size 24)

melody = \relative a' {
\clef treble
\key f \major
\time 3/4

a4 a4. g16( a |
bf8 c d bf c a) |
g4 c4. bf8( |
a g bf a g f) |

%5
d'2.( |
d2. |
d8) d( cs b a g |
f e g f e d) |

%9
a'4 a4. g16( a |
bf8 c d bf c a) |
g4 g f8( g |
a bf c a bf g) |

%13
f4 f4. e16( f |
g8 a bf a bf g) |
a4 g8( f e f |
d2.) |

%17
\repeat volta 2 {
\override Beam #'direction = #up
a'8( g f g a bf |
c) g( a bf c bf |
c) ef( d c bf a |
bf a c bf a g) |
\revert Beam #'direction

%21
cs4 cs4. b16( c |
d4) d4. cs16( d |
e8 f g e f d) |
f( e d cs b a) |

}

\bar "|."
}


#(set-global-staff-size 20)
\book {
   \header {
        title = "Minuet"
        composer = "J. S. Bach"
        instrument = "Soprano---flute"
   }
   \score {
      \melody
      \layout { }
   }
}

David Feuer