error[E0599]: `Vec<bool>` is not an iterator
  --> $DIR/vec-on-unimplemented.rs:2:23
   |
LL |     vec![true, false].map(|v| !v).collect::<Vec<_>>();
   |                       ^^^ `Vec<bool>` is not an iterator; try calling `.into_iter()` or `.iter()`
  --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
   |
   = note: doesn't satisfy `Vec<bool>: Iterator`
   |
   = note: the following trait bounds were not satisfied:
           `Vec<bool>: Iterator`
           which is required by `&mut Vec<bool>: Iterator`
           `[bool]: Iterator`
           which is required by `&mut [bool]: Iterator`

error: aborting due to previous error

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