mirror of https://github.com/rust-lang/rust
82 lines
1.6 KiB
Rust
82 lines
1.6 KiB
Rust
//@ run-pass
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#![allow(unused)]
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// Test copy
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struct A {
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a: i32,
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b: i32,
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}
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struct B {
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a: i32,
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b: C,
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}
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struct D {
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a: i32,
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d: C,
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}
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#[derive(Copy, Clone)]
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struct C {
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c: i32,
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}
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enum E {
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E { a: i32, e: C },
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NotE,
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}
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#[rustfmt::skip]
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pub fn main() {
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match (A {a: 10, b: 20}) {
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x@A {a, b: 20} => { assert!(x.a == 10); assert!(a == 10); }
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A {b: _b, ..} => { panic!(); }
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}
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let mut x@B {b, ..} = B {a: 10, b: C {c: 20}};
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assert_eq!(x.a, 10);
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x.b.c = 30;
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assert_eq!(b.c, 20);
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let mut y@D {d, ..} = D {a: 10, d: C {c: 20}};
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assert_eq!(y.a, 10);
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y.d.c = 30;
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assert_eq!(d.c, 20);
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match (E::E { a: 10, e: C { c: 20 } }) {
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x @ E::E{ a, e: C { c } } => {
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assert!(matches!(x, E::E { a: 10, e: C { c: 20 } }));
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assert!(a == 10);
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assert!(c == 20);
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}
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_ => panic!(),
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}
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match (E::E { a: 10, e: C { c: 20 } }) {
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mut x @ E::E{ a, e: C { mut c } } => {
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x = E::NotE;
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c += 30;
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assert_eq!(c, 50);
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}
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_ => panic!(),
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}
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let some_b = Some(B { a: 10, b: C { c: 20 } });
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// in irrefutable pattern
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if let Some(x @ B { b, .. }) = some_b {
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assert_eq!(x.b.c, 20);
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assert_eq!(b.c, 20);
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} else {
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unreachable!();
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}
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let some_b = Some(B { a: 10, b: C { c: 20 } });
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if let Some(x @ B { b: mut b @ C { c }, .. }) = some_b {
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assert_eq!(x.b.c, 20);
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assert_eq!(b.c, 20);
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b.c = 30;
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assert_eq!(b.c, 30);
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assert_eq!(c, 20);
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} else {
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unreachable!();
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}
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}
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