Comment #1 on issue 2891 by [email protected]: Hairpins ending on columns with no notes
http://code.google.com/p/lilypond/issues/detail?id=2891
Probably s, as opposed to \skip, should cause a MusicalColumn or NoteColumn or whatever it is that \! is looking for to be created.
I think that s should be a more tangible entity. \skip, in contrast, is pure time management.
