Re: [Lilypond-auto] Issue 3888 in lilypond: Completion_heads_engraver hangs after \time in mid-measure

[lilypond]

Updates:
        Summary: Completion_heads_engraver hangs after \time in mid-measure
        Owner: address@hidden

Comment #3 on issue 3888 by address@hidden: Completion_heads_engraver  
hangs after \time in mid-measure
http://code.google.com/p/lilypond/issues/detail?id=3888

Simpler test case:

\new Voice \with { \consists "Completion_heads_engraver" }
  { \time 12/8 c1 \time 6/8 c1 }

This bug has three parts:
 1) Changing the time signature in midmeasure can leave timing  
inconsistent, with measurePosition > measureLength.
 2) Completion_heads_engraver::next_moment takes this to mean there's  
negative time remaining in the measure, so it tries to create a note of  
negative duration.
 3) Duration::Duration calls intlog2 with a negative argument, which hangs.

Is \time in midmeasure ever valid? If not, it should probably warn (like a  
barcheck), to make errors like this and issue 3696 less confusing.

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