{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"if"}]}
                if self.tcx.features().impl_trait_in_fn_trait_return() {
            FnRetTy::Ty(ty) if matches!(itctx, ImplTraitContext::OpaqueTy { .. }) => {
                    self.lower_ty(ty, itctx)