syntax_data: {"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let cause = self.cause(ObligationCauseCode::ReferenceOutlivesReferent(t));
context_before:                 if !r.has_escaping_bound_vars() && !rty.has_escaping_bound_vars() {
context_after:                     self.out.push(traits::Obligation::with_depth(