{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"self,"}]}
    self, GenericArgKind, OpaqueHiddenType, OpaqueTypeKey, Ty, TyCtxt, TypeSuperVisitable,
use rustc_middle::ty::{
    TypeVisitable, TypeVisitableExt, TypeVisitor, fold_regions,