#[warn(clippy::from_iter_instead_of_collect)]
fn main() {
    let nums = [0, 1, 2];
    let _ = &String::from_iter(
        nums.iter().map(|&num| char::from_u32(num).unwrap()),
    );
}

warning: usage of `FromIterator::from_iter`
 --> src/main.rs:4:14
  |
4 |       let _ = &String::from_iter(
  |  ______________^
5 | |         nums.iter().map(|&num| char::from_u32(num).unwrap()),
6 | |     );
  | |_____^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#from_iter_instead_of_collect
note: the lint level is defined here
 --> src/main.rs:1:8
  |
1 | #[warn(clippy::from_iter_instead_of_collect)]
  |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: use `.collect()` instead of `::from_iter()`
  |
4 ~     let _ = &nums.iter().map(|&num| char::from_u32(num).unwrap()).collect::<String>();
  |

warning: `test_` (bin "test_") generated 1 warning
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s

warning: usage of `FromIterator::from_iter`
 --> src/main.rs:4:14
  |
4 |       let _ = &String::from_iter(
  |  ______________^
5 | |         nums.iter().map(|&num| char::from_u32(num).unwrap()),
6 | |     );
  | |_____^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#from_iter_instead_of_collect
note: the lint level is defined here
 --> src/main.rs:1:8
  |
1 | #[warn(clippy::from_iter_instead_of_collect)]
  |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: use `.collect()` instead of `::from_iter()`
  |
4 ~     let _ = &nums.iter().map(|&num| char::from_u32(num).unwrap()).collect::<String::from_iter(
5 ~         nums.iter().map(|&num| char<_>>();
  |

warning: `test_` (bin "test_") generated 1 warning
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s