fn main() {
    println!("{:?}", {
        String::from("call") + (0..10).map(|_| " ret")
    });
}


/* ~~~~=== stderr ===~~~~
   Compiling playground v0.0.1 (file:///playground)
error[E0308]: mismatched types
 --> src/main.rs:5:32
  |
5 |         String::from("call") + (0..10).map(|_| " ret")
  |                                ^^^^^^^^^^^^^^^^^^^^^^^ expected &str, found struct `std::iter::Map`
  |
  = note: expected type `&str`
             found type `std::iter::Map<std::ops::Range<{integer}>, [closure@src/main.rs:5:44: 5:54]>`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.
error: Could not compile `playground`.

To learn more, run the command again with --verbose.

*/

/* ~~~~=== stdout ===~~~~

*/