{"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"self.param_env,"}]}
                        self.param_env,
                        self.cause(base_expr.span, ObligationCauseCode::ArrayLen(adjusted_ty)),
                        ty::ClauseKind::ConstArgHasType(ct, self.tcx.types.usize),