rust-clippy/tests/ui/format_collect.stderr

error: use of `format!` to build up a string from an iterator
  --> $DIR/format_collect.rs:5:5
   |
LL |     bytes.iter().map(|b| format!("{b:02X}")).collect()
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: call `fold` instead
  --> $DIR/format_collect.rs:5:18
   |
LL |     bytes.iter().map(|b| format!("{b:02X}")).collect()
   |                  ^^^
help: ... and use the `write!` macro here
  --> $DIR/format_collect.rs:5:26
   |
LL |     bytes.iter().map(|b| format!("{b:02X}")).collect()
   |                          ^^^^^^^^^^^^^^^^^^
   = note: this can be written more efficiently by appending to a `String` directly
   = note: `-D clippy::format-collect` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::format_collect)]`

error: use of `format!` to build up a string from an iterator
  --> $DIR/format_collect.rs:11:5
   |
LL |     bytes.iter().map(|b| {{{{{ format!("{b:02X}") }}}}}).collect()
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: call `fold` instead
  --> $DIR/format_collect.rs:11:18
   |
LL |     bytes.iter().map(|b| {{{{{ format!("{b:02X}") }}}}}).collect()
   |                  ^^^
help: ... and use the `write!` macro here
  --> $DIR/format_collect.rs:11:32
   |
LL |     bytes.iter().map(|b| {{{{{ format!("{b:02X}") }}}}}).collect()
   |                                ^^^^^^^^^^^^^^^^^^
   = note: this can be written more efficiently by appending to a `String` directly

error: use of `format!` to build up a string from an iterator
  --> $DIR/format_collect.rs:26:5
   |
LL | /     (1..10)
LL | |
LL | |         .map(|s| {
LL | |             let y = 1;
LL | |             format!("{s} {y}")
LL | |         })
LL | |         .collect()
   | |__________________^
   |
help: call `fold` instead
  --> $DIR/format_collect.rs:28:10
   |
LL |         .map(|s| {
   |          ^^^
help: ... and use the `write!` macro here
  --> $DIR/format_collect.rs:30:13
   |
LL |             format!("{s} {y}")
   |             ^^^^^^^^^^^^^^^^^^
   = note: this can be written more efficiently by appending to a `String` directly

error: aborting due to 3 previous errors