src/tools/clippy/tests/ui/format.stderr

error: useless use of `format!`
  --> tests/ui/format.rs:13:5
   |
LL |     format!("foo");
   |     ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
   |
   = note: `-D clippy::useless-format` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::useless_format)]`

error: useless use of `format!`
  --> tests/ui/format.rs:15:5
   |
LL |     format!("{{}}");
   |     ^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{}".to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:17:5
   |
LL |     format!("{{}} abc {{}}");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{} abc {}".to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:19:5
   |
LL | /     format!(
LL | |
LL | |         r##"foo {{}}
LL | | " bar"##
LL | |     );
   | |_____^
   |
help: consider using `.to_string()`
   |
LL ~     r##"foo {}
LL ~ " bar"##.to_string();
   |

error: useless use of `format!`
  --> tests/ui/format.rs:25:13
   |
LL |     let _ = format!("");
   |             ^^^^^^^^^^^ help: consider using `String::new()`: `String::new()`

error: useless use of `format!`
  --> tests/ui/format.rs:28:5
   |
LL |     format!("{}", "foo");
   |     ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:37:5
   |
LL |     format!("{}", arg);
   |     ^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:68:5
   |
LL |     format!("{}", 42.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `42.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:71:5
   |
LL |     format!("{}", x.display().to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.display().to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:76:18
   |
LL |     let _ = Some(format!("{}", a + "bar"));
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `a + "bar"`

error: useless use of `format!`
  --> tests/ui/format.rs:81:22
   |
LL |     let _s: String = format!("{}", &*v.join("\n"));
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `(&*v.join("\n")).to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:88:13
   |
LL |     let _ = format!("{x}");
   |             ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:91:13
   |
LL |     let _ = format!("{y}", y = x);
   |             ^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:96:13
   |
LL |     let _ = format!("{abc}");
   |             ^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `abc.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:99:13
   |
LL |     let _ = format!("{xx}");
   |             ^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `xx.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:103:19
   |
LL |     let _: &str = &format!("hello");
   |                   ^^^^^^^^^^^^^^^^^ help: consider using the string literal directly: `"hello"`

error: useless use of `format!`
  --> tests/ui/format.rs:104:19
   |
LL |     let _: &str = &format!("{{}}");
   |                   ^^^^^^^^^^^^^^^^ help: consider using the string literal directly: `"{}"`

error: useless use of `format!`
  --> tests/ui/format.rs:105:19
   |
LL |     let _: &str = &format!(r"hello");
   |                   ^^^^^^^^^^^^^^^^^^ help: consider using the string literal directly: `r"hello"`

error: useless use of `format!`
  --> tests/ui/format.rs:106:19
   |
LL |     let _: &str = &format!(r#"world"#);
   |                   ^^^^^^^^^^^^^^^^^^^^ help: consider using the string literal directly: `r#"world"#`

error: useless use of `format!`
  --> tests/ui/format.rs:107:19
   |
LL |     let _: &str = &format!(r##"foo"##);
   |                   ^^^^^^^^^^^^^^^^^^^^ help: consider using the string literal directly: `r##"foo"##`

error: useless use of `format!`
  --> tests/ui/format.rs:108:19
   |
LL |     let _: &str = &format!(r##"hello "\u{{007B}}""##);
   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the string literal directly: `r##"hello "\u{007B}""##`

error: useless use of `format!`
  --> tests/ui/format.rs:110:31
   |
LL |     let _: &mut String = &mut format!("hello");
   |                               ^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"hello".to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:113:13
   |
LL |     literal(&format!("hello"));
   |             ^^^^^^^^^^^^^^^^^ help: consider using the string literal directly: `"hello"`

error: useless use of `format!`
  --> tests/ui/format.rs:114:14
   |
LL |     literal(&&format!("hello"));
   |              ^^^^^^^^^^^^^^^^^ help: consider using the string literal directly: `"hello"`

error: useless use of `format!`
  --> tests/ui/format.rs:117:13
   |
LL |     literal(&format!("{}", lit));
   |             ^^^^^^^^^^^^^^^^^^^ help: consider using the argument directly: `lit`

error: useless use of `format!`
  --> tests/ui/format.rs:118:13
   |
LL |     literal(&format!("{lit}"));
   |             ^^^^^^^^^^^^^^^^^ help: consider using the argument directly: `lit`

error: useless use of `format!`
  --> tests/ui/format.rs:148:27
   |
LL |         let _ = plain_mr!(format!("{}", s()));
   |                           ^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `s().to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:150:27
   |
LL |         let _ = block_mr!(format!("{}", s()));
   |                           ^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `s().to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:152:27
   |
LL |         let _ = plain_dm!(format!("{}", s()));
   |                           ^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `s().to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:154:27
   |
LL |         let _ = block_dm!(format!("{}", s()));
   |                           ^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `s().to_string()`

error: aborting due to 30 previous errors