{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"self.tcx.def_span(opaque_ty.def_id)"}]}
                        self.tcx.def_span(opaque_ty.def_id)
                    let return_span = if let ty::Alias(ty::Opaque, opaque_ty) = self.ty.kind() {
                    } else {