Add a special case error for [Range<T>; 1]

[reem]

[Range<T>; 1] is usually a mistake and often the source of type errors where Range<T> was meant, since you get it with [a..b], which is tempting from the syntax.

[Thiez]

In theory &[0..10] could be correct in a for loop...

When using this program:

fn main() {
    for r in [0..10] {
        println!("{:?}", r);
    }
}

the current error message appears to be

error: the trait `core::iter::Iterator` is not implemented for the type `[core::ops::Range<_>; 1]
note: `[core::ops::Range<_>; 1]` is not an iterator; maybe try calling `.iter()` or a similar method

Surely that is understandable ("Why is the iterator in a length-1 array? Oh, better remove the []").
What bothers me more is that both messages show up three times, and count as 3 errors...

[steveklabnik]

Triage: Same error, but only one time. It could be a bit better, probably.

[clarfonthey]

Shouldn't this be a clippy issue?