syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"self.match_poly_trait_ref(obligation,"}]}
source_snippet:         self.match_poly_trait_ref(obligation, where_clause_trait_ref)
context_before:     ) -> Result<PredicateObligations<'tcx>, ()> {
context_after:     }