Exhaustive integer matching

Exhaustive integer matching was stabilised in Rust 1.33.0. The original example in the question now works (updated to use the modern syntax for ranges).

fn main() {
    for i in std::u8::MIN..=std::u8::MAX {
        match i {
            0x00..=0xff => {}
        }
    }
}

As discussed in the referenced issue, Rust's exhaustiveness checking is based entirely on enums and never values, so this fails because u8 simply isn't an enum type.