{"ast_node_type":"impl","tokens":[{"end":94,"kind":"keyword","start":0,"text":"//"}]}
                // an impl method corresponds to a trait method with RPITITs in it. Therefore,
                // Due to the design of RPITITs, during AST lowering, we have no idea that
                // we don't have a list of early-bound region args for the RPITIT in the impl.