syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":")"}]}
source_snippet: ) -> Result<LeafDef, ErrorGuaranteed> {
context_before:     assoc_def_id: DefId,
context_after:     let trait_def_id = tcx.trait_id_of_impl(impl_def_id).unwrap();