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// run-pass
#![allow(non_shorthand_field_patterns)]
#![feature(box_syntax)]
struct Pair { a: Box<isize>, b: Box<isize> }
pub fn main() {
let mut x: Box<_> = box Pair {a: box 10, b: box 20};
let x_internal = &mut *x;
match *x_internal {
Pair {a: ref mut a, b: ref mut _b} => {
assert_eq!(**a, 10);
*a = box 30;
assert_eq!(**a, 30);
}
}
}
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