rust/tests/ui/binding/match-implicit-copy-unique.rs

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