Comment #29 on issue 2356 by mts...@gmail.com: Lilypond segfaults http://code.google.com/p/lilypond/issues/detail?id=2356
Go for it with the weak-key Scheme hash table - the garbage collection stuff is a bit over my head, but if it works, that's great! Otherwise, you can stay w/ the derived mark solution.
The map (in whatever form it takes) should be cleared at every stop_translation_time_step. You can add that to your patch. It's continually growing size is an oversight on my part from when I wrote the engraver.
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