error: useless use of `format!`
 --> format.rs:6:5
  |
6 |     format!("foo");
  |     ^^^^^^^^^^^^^^^
  |
  = note: `-D useless-format` implied by `-D warnings`

error: useless use of `format!`
 --> format.rs:8:5
  |
8 |     format!("{}", "foo");
  |     ^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `-D useless-format` implied by `-D warnings`

error: useless use of `format!`
  --> format.rs:15:5
   |
15 |     format!("{}", arg);
   |     ^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D useless-format` implied by `-D warnings`

error: aborting due to previous error(s)


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