ae0216d557
Follow up https://github.com/rust-lang/rust/pull/96861. This PR uses the traits added to the Rust 2021 Edition prelude. > The `TryInto`, `TryFrom` and `FromIterator` traits are now part of the prelude. https://doc.rust-lang.org/edition-guide/rust-2021/prelude.html
30 lines
616 B
Rust
30 lines
616 B
Rust
#![warn(clippy::map_err_ignore)]
|
|
#![allow(clippy::unnecessary_wraps)]
|
|
use std::error::Error;
|
|
use std::fmt;
|
|
|
|
#[derive(Debug)]
|
|
enum Errors {
|
|
Ignored,
|
|
}
|
|
|
|
impl Error for Errors {}
|
|
|
|
impl fmt::Display for Errors {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
write!(f, "Error")
|
|
}
|
|
}
|
|
|
|
fn main() -> Result<(), Errors> {
|
|
let x = u32::try_from(-123_i32);
|
|
|
|
println!("{:?}", x.map_err(|_| Errors::Ignored));
|
|
|
|
// Should not warn you because you explicitly ignore the parameter
|
|
// using a named wildcard value
|
|
println!("{:?}", x.map_err(|_foo| Errors::Ignored));
|
|
|
|
Ok(())
|
|
}
|