src/test/ui/lint/lint-type-overflow.rs

#![deny(overflowing_literals)]

fn test(x: i8) {
    println!("x {}", x);
}

#[allow(unused_variables)]
fn main() {
    let x1: u8 = 255; // should be OK
    let x1: u8 = 256; //~ error: literal out of range for `u8`

    let x1 = 255_u8; // should be OK
    let x1 = 256_u8; //~ error: literal out of range for `u8`

    let x2: i8 = -128; // should be OK
    let x1: i8 = 128; //~ error: literal out of range for `i8`

    let x3: i8 = -129; //~ error: literal out of range for `i8`
    let x3: i8 = -(129); //~ error: literal out of range for `i8`
    let x3: i8 = -{129}; //~ error: literal out of range for `i8`

    test(1000); //~ error: literal out of range for `i8`

    let x = 128_i8; //~ error: literal out of range for `i8`
    let x = 127_i8;
    let x = -128_i8;
    let x = -(128_i8);
    let x = -129_i8; //~ error: literal out of range for `i8`

    let x: i32 = 2147483647; // should be OK
    let x = 2147483647_i32; // should be OK
    let x: i32 = 2147483648; //~ error: literal out of range for `i32`
    let x = 2147483648_i32; //~ error: literal out of range for `i32`
    let x: i32 = -2147483648; // should be OK
    let x = -2147483648_i32; // should be OK
    let x: i32 = -2147483649; //~ error: literal out of range for `i32`
    let x = -2147483649_i32; //~ error: literal out of range for `i32`
    let x = 2147483648; //~ error: literal out of range for `i32`

    let x = 9223372036854775808_i64; //~ error: literal out of range for `i64`
    let x = -9223372036854775808_i64; // should be OK
    let x = 18446744073709551615_i64; //~ error: literal out of range for `i64`
    let x: i64 = -9223372036854775809; //~ error: literal out of range for `i64`
    let x = -9223372036854775809_i64; //~ error: literal out of range for `i64`
}