{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
        let Some(val) = self.eval_constant(constant) else { return };
        // No `super_constant` as we don't care about `visit_ty`/`visit_ty_const`.
        collect_const_value(self.tcx, val, self.used_items);