error: useless use of `format!`
  --> tests/ui/format.rs:19:5
   |
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:20:5
   |
LL |     format!("{{}}");
   |     ^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{}".to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:21:5
   |
LL |     format!("{{}} abc {{}}");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{} abc {}".to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:22:5
   |
LL | /     format!(
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:27:13
   |
LL |     let _ = format!("");
   |             ^^^^^^^^^^^ help: consider using `String::new()`: `String::new()`

error: useless use of `format!`
  --> tests/ui/format.rs:29:5
   |
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:67:5
   |
LL |     format!("{}", 42.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `42.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:69:5
   |
LL |     format!("{}", x.display().to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.display().to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:73:18
   |
LL |     let _ = Some(format!("{}", a + "bar"));
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `a + "bar"`

error: useless use of `format!`
  --> tests/ui/format.rs:77:22
   |
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:83:13
   |
LL |     let _ = format!("{x}");
   |             ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:85:13
   |
LL |     let _ = format!("{y}", y = x);
   |             ^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`

error: useless use of `format!`
  --> tests/ui/format.rs:89:13
   |
LL |     let _ = format!("{abc}");
   |             ^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `abc.to_string()`

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

error: aborting due to 15 previous errors