needless_range_loop triggering on collections created inside loop

[AtheMathmo]

I have some code like this:

for i in 0..10 {
    let mut id_col = vec![0f64; 10];
    id_col[i] = 1f64;
    // Do something with my id_col...
}        

This triggers the needless_range_loop:

warning: the loop variable i is only used to index id_col. Consider using for item in id_col.iter().take(self.rows) or similar iterators, #[warn(needless_range_loop)] on by default

But id_col does not exist outside of the loop.

I'm sure the code is terribly inefficient and I'd love a better way to do it but I think the lint isn't behaving correctly here.

Note: I edited the above example. In my original source code I'm using generics - I assume that won't make a difference.