rust/tests/ui/identity_conversion.rs

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#![deny(identity_conversion)]
fn test_generic<T: Copy>(val: T) -> T {
let _ = T::from(val);
val.into()
}
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.into();
Ok(Ok(()))
}??;
Ok(())
}
fn main() {
test_generic(10i32);
test_generic2::<i32, i32>(10i32);
test_questionmark().unwrap();
let _: String = "foo".into();
let _: String = From::from("foo");
let _ = String::from("foo");
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#[allow(identity_conversion)]
{
let _: String = "foo".into();
let _ = String::from("foo");
let _ = "".lines().into_iter();
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}
let _: String = "foo".to_string().into();
let _: String = From::from("foo".to_string());
let _ = String::from("foo".to_string());
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let _ = String::from(format!("A: {:04}", 123));
let _ = "".lines().into_iter();
let _ = vec![1, 2, 3].into_iter().into_iter();
}