mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-09-21 07:01:54 +00:00
cc622608db
`must_use_unit` lints unit-returning functions with a `#[must_use]` attribute, suggesting to remove it. `double_must_use` lints functions with a plain `#[must_use]` attribute, but which return a type which is already `#[must_use]`, so the attribute has no benefit. `must_use_candidate` is a pedantic lint that lints functions and methods that return some non-unit type that is not already `#[must_use]` and suggests to add the annotation.
53 lines
898 B
Rust
53 lines
898 B
Rust
#![warn(
|
|
clippy::all,
|
|
clippy::pedantic,
|
|
clippy::shadow_same,
|
|
clippy::shadow_reuse,
|
|
clippy::shadow_unrelated
|
|
)]
|
|
#![allow(
|
|
unused_parens,
|
|
unused_variables,
|
|
clippy::missing_docs_in_private_items,
|
|
clippy::single_match
|
|
)]
|
|
|
|
fn id<T>(x: T) -> T {
|
|
x
|
|
}
|
|
|
|
#[must_use]
|
|
fn first(x: (isize, isize)) -> isize {
|
|
x.0
|
|
}
|
|
|
|
fn main() {
|
|
let mut x = 1;
|
|
let x = &mut x;
|
|
let x = { x };
|
|
let x = (&*x);
|
|
let x = { *x + 1 };
|
|
let x = id(x);
|
|
let x = (1, x);
|
|
let x = first(x);
|
|
let y = 1;
|
|
let x = y;
|
|
|
|
let x;
|
|
x = 42;
|
|
|
|
let o = Some(1_u8);
|
|
|
|
if let Some(p) = o {
|
|
assert_eq!(1, p);
|
|
}
|
|
match o {
|
|
Some(p) => p, // no error, because the p above is in its own scope
|
|
None => 0,
|
|
};
|
|
|
|
match (x, o) {
|
|
(1, Some(a)) | (a, Some(1)) => (), // no error though `a` appears twice
|
|
_ => (),
|
|
}
|
|
}
|