syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let t = bound_predicate.rebind(t);
context_before:                 ty::PredicateKind::Clause(ty::ClauseKind::Trait(t)) => {
context_after:                     debug_assert!(!t.has_escaping_bound_vars());