rust/tests/ui/pattern/bindings-after-at/bind-by-copy.rs

// run-pass

// Test copy

struct A { a: i32, b: i32 }
struct B { a: i32, b: C }
struct D { a: i32, d: C }
#[derive(Copy,Clone)]
struct C { c: i32 }

pub fn main() {
    match (A {a: 10, b: 20}) {
        x@A {a, b: 20} => { assert!(x.a == 10); assert!(a == 10); }
        A {b: _b, ..} => { panic!(); }
    }

    let mut x@B {b, ..} = B {a: 10, b: C {c: 20}};
    assert_eq!(x.a, 10);
    x.b.c = 30;
    assert_eq!(b.c, 20);
    let mut y@D {d, ..} = D {a: 10, d: C {c: 20}};
    assert_eq!(y.a, 10);
    y.d.c = 30;
    assert_eq!(d.c, 20);

    let some_b = Some(B { a: 10, b: C { c: 20 } });

    // in irrefutable pattern
    if let Some(x @ B { b, .. }) = some_b {
        assert_eq!(x.b.c, 20);
        assert_eq!(b.c, 20);
    } else {
        unreachable!();
    }

    let some_b = Some(B { a: 10, b: C { c: 20 } });

    if let Some(x @ B { b: mut b @ C { c }, .. }) = some_b {
        assert_eq!(x.b.c, 20);
        assert_eq!(b.c, 20);
        b.c = 30;
        assert_eq!(b.c, 30);
        assert_eq!(c, 20);
    } else {
        unreachable!();
    }
}