syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let predicate = self.infcx.enter_forall_and_leak_universe(obligation.predicate);
context_before:     ) -> Result<PredicateObligations<'tcx>, ()> {
context_after:         let trait_ref = self.infcx.instantiate_binder_with_fresh_vars(