64 lines
2.0 KiB
Rust
64 lines
2.0 KiB
Rust
//@run-rustfix
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#![warn(clippy::manual_string_new)]
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macro_rules! create_strings_from_macro {
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// When inside a macro, nothing should warn to prevent false positives.
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($some_str:expr) => {
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let _: String = $some_str.into();
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let _ = $some_str.to_string();
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};
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}
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fn main() {
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// Method calls
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let _ = "".to_string();
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let _ = "no warning".to_string();
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let _ = "".to_owned();
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let _ = "no warning".to_owned();
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let _: String = "".into();
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let _: String = "no warning".into();
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let _: SomeOtherStruct = "no warning".into();
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let _: SomeOtherStruct = "".into(); // No warning too. We are not converting into String.
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// Calls
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let _ = String::from("");
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let _ = <String>::from("");
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let _ = String::from("no warning");
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let _ = SomeOtherStruct::from("no warning");
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let _ = SomeOtherStruct::from(""); // Again: no warning.
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let _ = String::try_from("").unwrap();
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let _ = String::try_from("no warning").unwrap();
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let _ = String::try_from("no warning").expect("this should not warn");
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let _ = SomeOtherStruct::try_from("no warning").unwrap();
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let _ = SomeOtherStruct::try_from("").unwrap(); // Again: no warning.
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let _: String = From::from("");
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let _: String = From::from("no warning");
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let _: SomeOtherStruct = From::from("no warning");
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let _: SomeOtherStruct = From::from(""); // Again: no warning.
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let _: String = TryFrom::try_from("").unwrap();
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let _: String = TryFrom::try_from("no warning").unwrap();
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let _: String = TryFrom::try_from("no warning").expect("this should not warn");
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let _: String = TryFrom::try_from("").expect("this should warn");
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let _: SomeOtherStruct = TryFrom::try_from("no_warning").unwrap();
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let _: SomeOtherStruct = TryFrom::try_from("").unwrap(); // Again: no warning.
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// Macros (never warn)
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create_strings_from_macro!("");
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create_strings_from_macro!("Hey");
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}
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struct SomeOtherStruct {}
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impl From<&str> for SomeOtherStruct {
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fn from(_value: &str) -> Self {
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Self {}
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}
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}
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