New upstream version 1.50.0+dfsg1

[rustc.git] / src / test / ui / destructuring-assignment / tuple_struct_destructure.rs

// run-pass

#![feature(destructuring_assignment)]

struct TupleStruct<S, T>(S, T);

impl<S, T> TupleStruct<S, T> {
    fn assign(self, first: &mut S, second: &mut T) {
        // Test usage of `Self` instead of the struct name:
        Self(*first, *second) = self
    }
}

enum Enum<S, T> {
    SingleVariant(S, T)
}

type Alias<S> = Enum<S, isize>;

fn main() {
    let (mut a, mut b);
    TupleStruct(a, b) = TupleStruct(0, 1);
    assert_eq!((a, b), (0, 1));
    TupleStruct(a, .., b) = TupleStruct(1, 2);
    assert_eq!((a, b), (1, 2));
    TupleStruct(_, a) = TupleStruct(2, 2);
    assert_eq!((a, b), (2, 2));
    TupleStruct(..) = TupleStruct(3, 4);
    assert_eq!((a, b), (2, 2));
    TupleStruct(5,6).assign(&mut a, &mut b);
    assert_eq!((a, b), (5, 6));
    Enum::SingleVariant(a, b) = Enum::SingleVariant(7, 8);
    assert_eq!((a, b), (7, 8));
    Alias::SingleVariant(a, b) = Alias::SingleVariant(9, 10);
    assert_eq!((a, b), (9, 10));
}