error: useless use of `format!`
  --> $DIR/format.rs:12:5
   |
12 |     format!("foo");
   |     ^^^^^^^^^^^^^^^ help: consider using .to_string(): `"foo".to_string()`
   |
   = note: `-D useless-format` implied by `-D warnings`

error: useless use of `format!`
  --> $DIR/format.rs:14:5
   |
14 |     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:17:5
   |
17 |     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:18:5
   |
18 |     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:23:5
   |
23 |     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:26:5
   |
26 |     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:27:5
   |
27 |     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: aborting due to 7 previous errors