syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Result<PredicateObligations<'tcx>, ()> {
context_before:         poly_trait_ref: ty::PolyTraitRef<'tcx>,
context_after:         let predicate = self.infcx.enter_forall_and_leak_universe(obligation.predicate);