> I am not sure there is a reasonable fix for this since \with does double > duty for passing named arguments to functions. You may want to argue > that \override/\revert should not be used in that fashion, but > assignments/\set have sort of the same problem (though admittedly > different syntax anyway).
It would be conceivable to keep "prop = val" as special syntax in the parser but make "\set" and "\override" parsed by the normal music function productions. (And it would not be unreasonable to introduce a dedicated syntax for alist instead of continuing to abuse \with for that purpose, either.)
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