syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> TraitObligationStack<'o, 'tcx> {
context_before:         obligation: &'o PolyTraitObligation<'tcx>,
context_after:         let fresh_trait_pred = obligation.predicate.fold_with(&mut self.freshener);