src/tools/clippy/tests/ui/manual_string_new.fixed

   1 // run-rustfix
   2
   3 #![warn(clippy::manual_string_new)]
   4
   5 macro_rules! create_strings_from_macro {
   6     // When inside a macro, nothing should warn to prevent false positives.
   7     ($some_str:expr) => {
   8         let _: String = $some_str.into();
   9         let _ = $some_str.to_string();
  10     };
  11 }
  12
  13 fn main() {
  14     // Method calls
  15     let _ = String::new();
  16     let _ = "no warning".to_string();
  17
  18     let _ = String::new();
  19     let _ = "no warning".to_owned();
  20
  21     let _: String = String::new();
  22     let _: String = "no warning".into();
  23
  24     let _: SomeOtherStruct = "no warning".into();
  25     let _: SomeOtherStruct = "".into(); // No warning too. We are not converting into String.
  26
  27     // Calls
  28     let _ = String::new();
  29     let _ = String::new();
  30     let _ = String::from("no warning");
  31     let _ = SomeOtherStruct::from("no warning");
  32     let _ = SomeOtherStruct::from(""); // Again: no warning.
  33
  34     let _ = String::new();
  35     let _ = String::try_from("no warning").unwrap();
  36     let _ = String::try_from("no warning").expect("this should not warn");
  37     let _ = SomeOtherStruct::try_from("no warning").unwrap();
  38     let _ = SomeOtherStruct::try_from("").unwrap(); // Again: no warning.
  39
  40     let _: String = String::new();
  41     let _: String = From::from("no warning");
  42     let _: SomeOtherStruct = From::from("no warning");
  43     let _: SomeOtherStruct = From::from(""); // Again: no warning.
  44
  45     let _: String = String::new();
  46     let _: String = TryFrom::try_from("no warning").unwrap();
  47     let _: String = TryFrom::try_from("no warning").expect("this should not warn");
  48     let _: String = String::new();
  49     let _: SomeOtherStruct = TryFrom::try_from("no_warning").unwrap();
  50     let _: SomeOtherStruct = TryFrom::try_from("").unwrap(); // Again: no warning.
  51
  52     // Macros (never warn)
  53     create_strings_from_macro!("");
  54     create_strings_from_macro!("Hey");
  55 }
  56
  57 struct SomeOtherStruct {}
  58
  59 impl From<&str> for SomeOtherStruct {
  60     fn from(_value: &str) -> Self {
  61         Self {}
  62     }
  63 }