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starting to add syntax and semantics of syntax role modifiers #15
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@PaulKlint this is a draft; will grow slowly to implement the type constructors:
data[..]syntax[..]lexical[..]layout[..]andkeyword[..]Represented by
amodifyTo(AType arg, SyntaxRole sr)and applies toaadt(_,_,SyntaxRole sr)to modify the syntax role. The tricky details are in matching and instantiation, i.e. the semantics of matching againstdata[&T]and then instantiating asyntax[&T]where&Tis bound.