mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-04 20:54:13 +00:00
178 lines
3.4 KiB
Rust
178 lines
3.4 KiB
Rust
// run-rustfix
|
|
|
|
#![feature(lint_reasons)]
|
|
#![warn(clippy::let_unit_value)]
|
|
#![allow(unused, clippy::no_effect, clippy::needless_late_init, path_statements)]
|
|
|
|
macro_rules! let_and_return {
|
|
($n:expr) => {{
|
|
let ret = $n;
|
|
}};
|
|
}
|
|
|
|
fn main() {
|
|
let _x = println!("x");
|
|
let _y = 1; // this is fine
|
|
let _z = ((), 1); // this as well
|
|
if true {
|
|
let _a = ();
|
|
}
|
|
|
|
consume_units_with_for_loop(); // should be fine as well
|
|
|
|
multiline_sugg();
|
|
|
|
let_and_return!(()) // should be fine
|
|
}
|
|
|
|
// Related to issue #1964
|
|
fn consume_units_with_for_loop() {
|
|
// `for_let_unit` lint should not be triggered by consuming them using for loop.
|
|
let v = vec![(), (), ()];
|
|
let mut count = 0;
|
|
for _ in v {
|
|
count += 1;
|
|
}
|
|
assert_eq!(count, 3);
|
|
|
|
// Same for consuming from some other Iterator<Item = ()>.
|
|
let (tx, rx) = ::std::sync::mpsc::channel();
|
|
tx.send(()).unwrap();
|
|
drop(tx);
|
|
|
|
count = 0;
|
|
for _ in rx.iter() {
|
|
count += 1;
|
|
}
|
|
assert_eq!(count, 1);
|
|
}
|
|
|
|
fn multiline_sugg() {
|
|
let v: Vec<u8> = vec![2];
|
|
|
|
let _ = v
|
|
.into_iter()
|
|
.map(|i| i * 2)
|
|
.filter(|i| i % 2 == 0)
|
|
.map(|_| ())
|
|
.next()
|
|
.unwrap();
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
pub struct ContainsUnit(()); // should be fine
|
|
|
|
fn _returns_generic() {
|
|
fn f<T>() -> T {
|
|
unimplemented!()
|
|
}
|
|
fn f2<T, U>(_: T) -> U {
|
|
unimplemented!()
|
|
}
|
|
fn f3<T>(x: T) -> T {
|
|
x
|
|
}
|
|
fn f5<T: Default>(x: bool) -> Option<T> {
|
|
x.then(|| T::default())
|
|
}
|
|
|
|
let _: () = f(); // Ok
|
|
let x: () = f(); // Lint.
|
|
|
|
let _: () = f2(0i32); // Ok
|
|
let x: () = f2(0i32); // Lint.
|
|
|
|
let _: () = f3(()); // Lint
|
|
let x: () = f3(()); // Lint
|
|
|
|
// Should lint:
|
|
// fn f4<T>(mut x: Vec<T>) -> T {
|
|
// x.pop().unwrap()
|
|
// }
|
|
// let _: () = f4(vec![()]);
|
|
// let x: () = f4(vec![()]);
|
|
|
|
// Ok
|
|
let _: () = {
|
|
let x = 5;
|
|
f2(x)
|
|
};
|
|
|
|
let _: () = if true { f() } else { f2(0) }; // Ok
|
|
let x: () = if true { f() } else { f2(0) }; // Lint
|
|
|
|
// Ok
|
|
let _: () = match Some(0) {
|
|
None => f2(1),
|
|
Some(0) => f(),
|
|
Some(1) => f2(3),
|
|
Some(_) => f2('x'),
|
|
};
|
|
|
|
// Lint
|
|
let _: () = match Some(0) {
|
|
None => f2(1),
|
|
Some(0) => f(),
|
|
Some(1) => f2(3),
|
|
Some(_) => (),
|
|
};
|
|
|
|
let _: () = f5(true).unwrap();
|
|
|
|
#[allow(clippy::let_unit_value)]
|
|
{
|
|
let x = f();
|
|
let y;
|
|
let z;
|
|
match 0 {
|
|
0 => {
|
|
y = f();
|
|
z = f();
|
|
},
|
|
1 => {
|
|
println!("test");
|
|
y = f();
|
|
z = f3(());
|
|
},
|
|
_ => panic!(),
|
|
}
|
|
|
|
let x1;
|
|
let x2;
|
|
if true {
|
|
x1 = f();
|
|
x2 = x1;
|
|
} else {
|
|
x2 = f();
|
|
x1 = x2;
|
|
}
|
|
|
|
let opt;
|
|
match f5(true) {
|
|
Some(x) => opt = x,
|
|
None => panic!(),
|
|
};
|
|
|
|
#[warn(clippy::let_unit_value)]
|
|
{
|
|
let _: () = x;
|
|
let _: () = y;
|
|
let _: () = z;
|
|
let _: () = x1;
|
|
let _: () = x2;
|
|
let _: () = opt;
|
|
}
|
|
}
|
|
|
|
let () = f();
|
|
}
|
|
|
|
fn attributes() {
|
|
fn f() {}
|
|
|
|
#[allow(clippy::let_unit_value)]
|
|
let _ = f();
|
|
#[expect(clippy::let_unit_value)]
|
|
let _ = f();
|
|
}
|