Closed
Description
The following code only reports one error instead of two:
#[derive(Clone, Copy, Debug)]
pub struct GreaterThanTwo(u16);
impl GreaterThanTwo {
/// Builds a [`GreaterThanTwo`] who's inner value is at least `2`.
pub const fn new(value: u16) -> Self {
let _ = value - 2;
Self(value)
}
}
pub trait Constants {
const COUNT: GreaterThanTwo;
}
pub struct Config;
impl Constants for Config {
const COUNT: GreaterThanTwo = GreaterThanTwo::new(0);
}
pub const OTHER_COUNT: GreaterThanTwo = GreaterThanTwo::new(0);The COUNT variable inside of the Constants implementation does not trigger a const_err error where OTHER_COUNT does.
error: any use of this value will cause an error
--> src/lib.rs:7:18
|
7 | let _ = value - 2;
| ^^^^^^^^^
| |
| attempt to compute `0_u16 - 2_u16`, which would overflow
| inside `GreaterThanTwo::new` at src/lib.rs:7:18
| inside `OTHER_COUNT` at src/lib.rs:22:41
...
22 | pub const OTHER_COUNT: GreaterThanTwo = GreaterThanTwo::new(0);
| ---------------------------------------------------------------
|
= note: `#[deny(const_err)]` on by default
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
error: could not compile `playground` due to previous error