116 lines
2.2 KiB
Rust
116 lines
2.2 KiB
Rust
// run-rustfix
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#![warn(clippy::let_unit_value)]
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#![allow(clippy::no_effect)]
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#![allow(unused_variables)]
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macro_rules! let_and_return {
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($n:expr) => {{
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let ret = $n;
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}};
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}
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fn main() {
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let _x = println!("x");
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let _y = 1; // this is fine
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let _z = ((), 1); // this as well
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if true {
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let _a = ();
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}
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consume_units_with_for_loop(); // should be fine as well
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multiline_sugg();
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let_and_return!(()) // should be fine
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}
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// Related to issue #1964
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fn consume_units_with_for_loop() {
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// `for_let_unit` lint should not be triggered by consuming them using for loop.
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let v = vec![(), (), ()];
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let mut count = 0;
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for _ in v {
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count += 1;
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}
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assert_eq!(count, 3);
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// Same for consuming from some other Iterator<Item = ()>.
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let (tx, rx) = ::std::sync::mpsc::channel();
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tx.send(()).unwrap();
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drop(tx);
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count = 0;
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for _ in rx.iter() {
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count += 1;
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}
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assert_eq!(count, 1);
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}
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fn multiline_sugg() {
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let v: Vec<u8> = vec![2];
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let _ = v
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.into_iter()
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.map(|i| i * 2)
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.filter(|i| i % 2 == 0)
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.map(|_| ())
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.next()
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.unwrap();
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}
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#[derive(Copy, Clone)]
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pub struct ContainsUnit(()); // should be fine
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fn _returns_generic() {
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fn f<T>() -> T {
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unimplemented!()
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}
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fn f2<T, U>(_: T) -> U {
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unimplemented!()
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}
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fn f3<T>(x: T) -> T {
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x
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}
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fn f4<T>(mut x: Vec<T>) -> T {
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x.pop().unwrap()
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}
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let _: () = f(); // Ok
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let x: () = f(); // Lint.
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let _: () = f2(0i32); // Ok
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let x: () = f2(0i32); // Lint.
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let _: () = f3(()); // Lint
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let x: () = f3(()); // Lint
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let _: () = f4(vec![()]); // Lint
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let x: () = f4(vec![()]); // Lint
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// Ok
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let _: () = {
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let x = 5;
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f2(x)
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};
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let _: () = if true { f() } else { f2(0) }; // Ok
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let x: () = if true { f() } else { f2(0) }; // Lint
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// Ok
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let _: () = match Some(0) {
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None => f2(1),
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Some(0) => f(),
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Some(1) => f2(3),
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Some(_) => f2('x'),
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};
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// Lint
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let _: () = match Some(0) {
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None => f2(1),
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Some(0) => f(),
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Some(1) => f2(3),
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Some(_) => (),
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};
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}
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