One neat thing Rust let you do is put underscores in number literals. It's great for readibility:

    0xFFFF_FFFF // easier to count than 8 Fs

And you can use that with type suffixes:

    let a = 255_u8;

Although in that case, you'd probably either omit u8 entirely, letting the compiler infer the type of 'a' from usage, or use a colon to give it ane explicit type.

Type suffixes are especially useful for arguments to generic functions:

    write_le(12_u32);
    write_le(255_u8);