{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"if"}]}
        if let Value::Cast { kind, value: from } = self.get(inner)
        // We have an unsizing cast, which assigns the length to wide pointer metadata.
            && let CastKind::PointerCoercion(ty::adjustment::PointerCoercion::Unsize, _) = kind