Add type variables and quantifiers to the AST #775
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Nothing is done with them at the moment; but that expands what can be expressed and support can then be added progressively; in time, with this, special support for operators could be limited to overloads. - types "TAny" are replaced with fresh type variables. - The monomorphisation pass obviously needs some more effort - side change: the type printer is simplified to never explicit inline structure types, that just is too verbose on real code.
This doesn't of course implement generic monomorphisation over quantified types, only fixes on par with what it could handle previously.
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Note that they don't do much at the moment, basically this replaces
TAnyplaceholders with type variables ; the translation to and from unionfind types is done on the boundaries of the typer. Structs and enums don't support quantifiers yet.The type printer is also simplified and made less verbose by removing the
_debugfunctions and not repeating the details of structs and enum every time.