{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"assert_eq!(self.mir_def.to_def_id(),"}]}
                assert_eq!(self.mir_def.to_def_id(), def_id);
                // "output" (the type of the constant).
                let ty = tcx.type_of(self.mir_def).instantiate_identity();