Macro newtype_unit 

macro_rules! newtype_unit {
    ($name:ident, i8) => { ... };
    ($name:ident, u8) => { ... };
    ($name:ident, i16) => { ... };
    ($name:ident, u16) => { ... };
    ($name:ident, i32) => { ... };
    ($name:ident, u32) => { ... };
    ($name:ident, i64) => { ... };
    ($name:ident, u64) => { ... };
    ($name:ident, i128) => { ... };
    ($name:ident, u128) => { ... };
    ($name:ident, i8; $($derive:path),+) => { ... };
    ($name:ident, u8; $($derive:path),+) => { ... };
    ($name:ident, i16; $($derive:path),+) => { ... };
    ($name:ident, u16; $($derive:path),+) => { ... };
    ($name:ident, i32; $($derive:path),+) => { ... };
    ($name:ident, u32; $($derive:path),+) => { ... };
    ($name:ident, i64; $($derive:path),+) => { ... };
    ($name:ident, u64; $($derive:path),+) => { ... };
    ($name:ident, i128; $($derive:path),+) => { ... };
    ($name:ident, u128; $($derive:path),+) => { ... };
    ($name:ident, f32) => { ... };
    ($name:ident, f64) => { ... };
    ($name:ident, f32; $($derive:path),+) => { ... };
    ($name:ident, f64; $($derive:path),+) => { ... };
}

TODO: Pending to write…