fix: generalize types before generating built-in Normalize
clauses
#797
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When we generate built-in
Normalize
clauses,self_ty
in the original goal may contain bound variables that prevent us from using it as-is. We need to universally quantify over the bound variables before passing it to trait-specific clause generators, which we've been failing to do forDiscriminantKind
.cc rust-lang/rust-analyzer#15113