syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Result<PredicateObligations<'tcx>, ()> {
context_before:         where_clause_trait_ref: ty::PolyTraitRef<'tcx>,
context_after:         self.match_poly_trait_ref(obligation, where_clause_trait_ref)