syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"rcvr_args:"}]}
source_snippet:     rcvr_args: GenericArgsRef<'tcx>,
context_before:     trait_id: DefId,
context_after: ) -> Result<Option<Instance<'tcx>>, ErrorGuaranteed> {