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cmd/compile: remove Type.Vargen #19878
The only place that Type.Vargen is written is in typechecking, where is it set with
I'd send a CL, but amusingly, yesterday's refactoring made it more difficult, because Nod fields are now inaccessible from Types. If we switch to using (say) an interface for Type.Nod, then the Node Vargen lookup could become part of that interface. Conveniently, removing Type.Vargen would almost pay for that, size-wise.
Apologies for making things more difficult. Hopefully this is temporary. To a large extent, types, symbols, and scopes (dclstack etc) should be able to stand alone, which hopefully should allow significant disentanglements in the long run. In the short run, things are a bit ugly.