fn main() {
    println!("{:?}", {
        fn foo() -> impl Iterator { panic!() }
    });
}


/* ~~~~=== stderr ===~~~~
   Compiling playground v0.0.1 (file:///playground)
error[E0277]: the trait bound `(): std::iter::Iterator` is not satisfied
 --> src/main.rs:5:21
  |
5 |         fn foo() -> impl Iterator { panic!() }
  |                     ^^^^^^^^^^^^^ `()` is not an iterator; maybe try calling `.iter()` or a similar method
  |
  = help: the trait `std::iter::Iterator` is not implemented for `()`
  = note: the return type of a function must have a statically known size

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: Could not compile `playground`.

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

*/

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

*/