Hi,
While "c4:32" correctly expresses a quarter note stem tremolo slashes,
typing (badly-formed) "r4:32" probably only happens when a user is editing
a source file and changes a note to a rest without regard for the stem
tremolo suffix.
However, rather than raising some type of error or warning, Lily fails
silently on this type of badly-formed construction.
[…]
Rather than failing silently, Lily should raise an error or warning:
imagine a large input file failing for no apparent reason and then having
to bisect the entire thing find a single instance of something like
"r4:32".
Thanks,
Trevor.