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// check-pass
// Test that `ref` patterns may be used on both sides
// of an `@` pattern according to NLL borrowck.
fn main() {
struct U; // Not copy!
// Promotion:
let ref a @ ref b = U;
let _: &U = a;
let _: &U = b;
// Prevent promotion:
fn u() -> U { U }
let ref a @ ref b = u();
let _: &U = a;
let _: &U = b;
let ref a @ (ref b, [ref c, ref d]) = (u(), [u(), u()]);
let _: &(U, [U; 2]) = a;
let _: &U = b;
let _: &U = c;
let _: &U = d;
fn f1(ref a @ (ref b, [ref c, ref mid @ .., ref d]): (U, [U; 4])) {}
let a @ (b, [c, d]) = &(u(), [u(), u()]);
let _: &(U, [U; 2]) = a;
let _: &U = b;
let _: &U = c;
let _: &U = d;
let ref a @ &ref b = &u();
let _: &&U = a;
let _: &U = b;
match Ok(u()) {
ref a @ Ok(ref b) | ref a @ Err(ref b) => {
let _: &Result<U, U> = a;
let _: &U = b;
}
}
}
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