51 lines
2.0 KiB
Rust
51 lines
2.0 KiB
Rust
#![deny(clippy::useless_conversion)]
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#![allow(clippy::needless_if)]
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fn test_generic<T: Copy>(val: T) -> T {
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let _ = T::try_from(val).unwrap();
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//~^ ERROR: useless conversion to the same type: `T`
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val.try_into().unwrap()
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//~^ ERROR: useless conversion to the same type: `T`
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}
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fn test_generic2<T: Copy + Into<i32> + Into<U>, U: From<T>>(val: T) {
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// ok
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let _: i32 = val.try_into().unwrap();
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let _: U = val.try_into().unwrap();
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let _ = U::try_from(val).unwrap();
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}
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fn main() {
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test_generic(10i32);
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test_generic2::<i32, i32>(10i32);
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let _: String = "foo".try_into().unwrap();
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let _: String = TryFrom::try_from("foo").unwrap();
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let _ = String::try_from("foo").unwrap();
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#[allow(clippy::useless_conversion)]
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{
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let _ = String::try_from("foo").unwrap();
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let _: String = "foo".try_into().unwrap();
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}
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let _: String = "foo".to_string().try_into().unwrap();
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//~^ ERROR: useless conversion to the same type: `std::string::String`
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let _: String = TryFrom::try_from("foo".to_string()).unwrap();
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//~^ ERROR: useless conversion to the same type: `std::string::String`
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let _ = String::try_from("foo".to_string()).unwrap();
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//~^ ERROR: useless conversion to the same type: `std::string::String`
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let _ = String::try_from(format!("A: {:04}", 123)).unwrap();
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//~^ ERROR: useless conversion to the same type: `std::string::String`
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let _: String = format!("Hello {}", "world").try_into().unwrap();
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//~^ ERROR: useless conversion to the same type: `std::string::String`
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let _: String = String::new().try_into().unwrap();
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//~^ ERROR: useless conversion to the same type: `std::string::String`
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let _: String = match String::from("_").try_into() {
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//~^ ERROR: useless conversion to the same type: `std::string::String`
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Ok(a) => a,
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Err(_) => String::new(),
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};
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// FIXME this is a false negative
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#[allow(clippy::cmp_owned)]
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if String::from("a") == TryInto::<String>::try_into(String::from("a")).unwrap() {}
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}
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