Comment #4 on issue 3744 by [email protected]: Patch: Create Score context
before starting iteration.
http://code.google.com/p/lilypond/issues/detail?id=3744
\new Score works because ly_interpret_music_expression calls
construct_children before starting iteration, apparently to create the
initial contexts. Context_specced_music_iterator creates its context then,
and other iterators recurse on their music, but Sequential_iterator only
recurses on its first child instead of the whole first timestep, so things
like { | c8 } don't create contexts.
Maybe create_children could be made reliable and run at the beginning of
each timestep, so contexts would never be created in the middle of a
timestep.
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