serde_json::forward_to_deserialize

macro_rules! forward_to_deserialize {
    ($(
        $name:ident ( $( $arg:ident : $ty:ty ),* );
    )*) => { ... };
    (func: deserialize_enum ( $( $arg:ident : $ty:ty ),* );) => { ... };
    (func: $name:ident ( $( $arg:ident : $ty:ty ),* );) => { ... };
}