rust-clippy/tests/ui/format.stderr

error: useless use of `format!`
  --> $DIR/format.rs:21:5
   |
21 |     format!("foo");
   |     ^^^^^^^^^^^^^^^ help: consider using .to_string(): `"foo".to_string()`
   |
   = note: `-D clippy::useless-format` implied by `-D warnings`

error: useless use of `format!`
  --> $DIR/format.rs:23:5
   |
23 |     format!("{}", "foo");
   |     ^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"foo".to_string()`
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: useless use of `format!`
  --> $DIR/format.rs:27:5
   |
27 |     format!("{:+}", "foo"); // warn when the format makes no difference
   |     ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"foo".to_string()`
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: useless use of `format!`
  --> $DIR/format.rs:28:5
   |
28 |     format!("{:<}", "foo"); // warn when the format makes no difference
   |     ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"foo".to_string()`
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: useless use of `format!`
  --> $DIR/format.rs:33:5
   |
33 |     format!("{}", arg);
   |     ^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `arg.to_string()`
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: useless use of `format!`
  --> $DIR/format.rs:37:5
   |
37 |     format!("{:+}", arg); // warn when the format makes no difference
   |     ^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `arg.to_string()`
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: useless use of `format!`
  --> $DIR/format.rs:38:5
   |
38 |     format!("{:<}", arg); // warn when the format makes no difference
   |     ^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `arg.to_string()`
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: useless use of `format!`
  --> $DIR/format.rs:65:5
   |
65 |     format!("{}", 42.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: `to_string()` is enough: `42.to_string()`
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: useless use of `format!`
  --> $DIR/format.rs:67:5
   |
67 |     format!("{}", x.display().to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: `to_string()` is enough: `x.display().to_string()`
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to 9 previous errors