rust/tests/ui/useless_conversion.fixed

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// run-rustfix
#![deny(clippy::useless_conversion)]
fn test_generic<T: Copy>(val: T) -> T {
let _ = val;
val
}
fn test_generic2<T: Copy + Into<i32> + Into<U>, U: From<T>>(val: T) {
// ok
let _: i32 = val.into();
let _: U = val.into();
let _ = U::from(val);
}
fn test_questionmark() -> Result<(), ()> {
{
let _: i32 = 0i32;
Ok(Ok(()))
}??;
Ok(())
}
fn test_issue_3913() -> Result<(), std::io::Error> {
use std::fs;
use std::path::Path;
let path = Path::new(".");
for _ in fs::read_dir(path)? {}
Ok(())
}
fn main() {
test_generic(10i32);
test_generic2::<i32, i32>(10i32);
test_questionmark().unwrap();
test_issue_3913().unwrap();
let _: String = "foo".into();
let _: String = From::from("foo");
let _ = String::from("foo");
#[allow(clippy::useless_conversion)]
{
let _: String = "foo".into();
let _ = String::from("foo");
let _ = "".lines().into_iter();
}
let _: String = "foo".to_string();
let _: String = "foo".to_string();
let _ = "foo".to_string();
let _ = format!("A: {:04}", 123);
let _ = "".lines();
let _ = vec![1, 2, 3].into_iter();
let _: String = format!("Hello {}", "world");
}