error[E0277]: the trait bound `&str: std::iter::Iterator` is not satisfied
  --> $DIR/for-c-in-str.rs:14:14
   |
LL |     for c in "asdf" {
   |              ^^^^^^ `&str` is not an iterator; try calling `.chars()` or `.bytes()`
   |
   = help: the trait `std::iter::Iterator` is not implemented for `&str`
   = note: required by `std::iter::IntoIterator::into_iter`

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0277"