error: `format!(..)` appended to existing `String` --> $DIR/format_push_string.rs:5:5 | LL | string += &format!("{:?}", 1234); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D clippy::format-push-string` implied by `-D warnings` = help: consider using `write!` to avoid the extra allocation error: `format!(..)` appended to existing `String` --> $DIR/format_push_string.rs:6:5 | LL | string.push_str(&format!("{:?}", 5678)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: consider using `write!` to avoid the extra allocation error: aborting due to 2 previous errors