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[wishlist] Extensible grammars

I'd like to have extensible grammars, in the style of Polyglot's PPG
extension to CUP:


The relevant features are "include", "drop", "override", "extend", and

I'm currently evaluating several tools for use in a Java extension, and
the ability to extend a large existing grammar by writing a delta rather
than editing the original grammar file would be handy.  I like SableCC
much better than CUP, but SableCC doesn't have this feature.  It seems
that it would be a simple addition.