"Expected `fn`, found `something`" should say "Expected `fn` or `type`, found `something`"

[wackywendell]

If you are trying to write a new trait that should look like this:

trait MyTrait<T> : Iterator {
    type Item = T
    ...
}

And you leave out the word type, like in this example, you get the error message

error: expected `fn`, found `Item`

Even though the missing word is type, not fn.