types with a raw pointer appearing twice are considered to be dropck types

[arielb1]

use std::fmt;
struct NoisyDrop<T: fmt::Debug>(T);
impl<T: fmt::Debug> Drop for NoisyDrop<T> {
    fn drop(&mut self) { println!("dropping {:?}", self.0) }
}

struct Bar<T: fmt::Debug>([*const NoisyDrop<T>; 2]);

fn fine() {
    let (u,b);
    u = vec![43];
    b = Bar([&NoisyDrop(&u), &NoisyDrop(&u)]);
    // ^ this compiles
}

struct Bar2<T: fmt::Debug>(*const NoisyDrop<T>, *const NoisyDrop<T>);

fn lolwut() {
    let (u,v);
    u = vec![43];
    v = Bar2(&NoisyDrop(&u), &NoisyDrop(&u));
    //~^ ERROR `u` does not live long enough
}

fn main() {}

cc @pnkfelix