error: useless use of `format!` --> $DIR/format.rs:6:5 | 6 | format!("foo"); | ^^^^^^^^^^^^^^^ | note: lint level defined here --> $DIR/format.rs:3:9 | 3 | #![deny(useless_format)] | ^^^^^^^^^^^^^^ error: useless use of `format!` --> $DIR/format.rs:8:5 | 8 | format!("{}", "foo"); | ^^^^^^^^^^^^^^^^^^^^^ error: useless use of `format!` --> $DIR/format.rs:15:5 | 15 | format!("{}", arg); | ^^^^^^^^^^^^^^^^^^^ error: aborting due to 3 previous errors