rust/tests/ui/invalid_upcast_comparisons.rs

82 lines
1.7 KiB
Rust
Raw Normal View History

2017-09-18 12:47:33 +02:00
#![warn(invalid_upcast_comparisons)]
#![allow(unused, eq_op, no_effect, unnecessary_operation, cast_lossless)]
fn mk_value<T>() -> T { unimplemented!() }
fn main() {
let u32: u32 = mk_value();
let u8: u8 = mk_value();
let i32: i32 = mk_value();
let i8: i8 = mk_value();
// always false, since no u8 can be > 300
(u8 as u32) > 300;
(u8 as i32) > 300;
(u8 as u32) == 300;
(u8 as i32) == 300;
300 < (u8 as u32);
300 < (u8 as i32);
300 == (u8 as u32);
300 == (u8 as i32);
// inverted of the above
(u8 as u32) <= 300;
(u8 as i32) <= 300;
(u8 as u32) != 300;
(u8 as i32) != 300;
300 >= (u8 as u32);
300 >= (u8 as i32);
300 != (u8 as u32);
300 != (u8 as i32);
// always false, since u8 -> i32 doesn't wrap
(u8 as i32) < 0;
-5 != (u8 as i32);
// inverted of the above
(u8 as i32) >= 0;
-5 == (u8 as i32);
// always false, since no u8 can be 1337
1337 == (u8 as i32);
1337 == (u8 as u32);
// inverted of the above
1337 != (u8 as i32);
1337 != (u8 as u32);
2016-04-02 15:51:28 +02:00
// Those are Ok:
(u8 as u32) > 20;
42 == (u8 as i32);
42 != (u8 as i32);
42 > (u8 as i32);
(u8 as i32) == 42;
(u8 as i32) != 42;
(u8 as i32) > 42;
(u8 as i32) < 42;
(u8 as i8) == -1;
(u8 as i8) != -1;
(u8 as i32) > -1;
(u8 as i32) < -1;
(u32 as i32) < -5;
(u32 as i32) < 10;
(i8 as u8) == 1;
(i8 as u8) != 1;
(i8 as u8) < 1;
(i8 as u8) > 1;
(i32 as u32) < 5;
(i32 as u32) < 10;
-5 < (u32 as i32);
0 <= (u32 as i32);
0 < (u32 as i32);
-5 > (u32 as i32);
-5 >= (u8 as i32);
-5 == (u32 as i32);
}