error[E0599]: `&'static [i32]` is not an iterator
  --> $DIR/issue-94581.rs:6:29
   |
LL |     let sqsum = get_slice().map(|i| i * i).sum();
   |                             ^^^ `&'static [i32]` is not an iterator; try calling `.iter()`
   |
   = note: the following trait bounds were not satisfied:
           `&'static [i32]: Iterator`
           which is required by `&mut &'static [i32]: Iterator`
           `[i32]: Iterator`
           which is required by `&mut [i32]: Iterator`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.