error[E0277]: `dyn Iterator<Item = &'a mut u8>` is not an iterator
  --> $DIR/issue-20605.rs:6:17
   |
LL |     for item in *things { *item = 0 }
   |                 ^^^^^^^ `dyn Iterator<Item = &'a mut u8>` is not an iterator
   |
   = help: the trait `IntoIterator` is not implemented for `dyn Iterator<Item = &'a mut u8>`

error: the type `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter` is not well-formed
  --> $DIR/issue-20605.rs:6:17
   |
LL |     for item in *things { *item = 0 }
   |                 ^^^^^^^

error: the type `&mut <dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter` is not well-formed
  --> $DIR/issue-20605.rs:6:17
   |
LL |     for item in *things { *item = 0 }
   |                 ^^^^^^^

error: the type `Option<<<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter as Iterator>::Item>` is not well-formed
  --> $DIR/issue-20605.rs:6:17
   |
LL |     for item in *things { *item = 0 }
   |                 ^^^^^^^

error[E0614]: type `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::Item` cannot be dereferenced
  --> $DIR/issue-20605.rs:6:27
   |
LL |     for item in *things { *item = 0 }
   |                           ^^^^^

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0277, E0614.
For more information about an error, try `rustc --explain E0277`.