syntax_data: {"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let predicate = ty::Binder::dummy(ty::PredicateKind::Clause(
context_before:                 if !c.has_escaping_bound_vars() {
context_after:                         ty::ClauseKind::ConstEvaluatable(c),