rust/src/test/compile-fail/borrowck-anon-fields-variant.rs

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// Tests that we are able to distinguish when loans borrow different
// anonymous fields of an enum variant vs the same anonymous field.
enum Foo {
X, Y(uint, uint)
}
fn distinct_variant() {
let mut y = Y(1, 2);
let a = match y {
Y(ref mut a, _) => a,
X => fail!()
};
let b = match y {
Y(_, ref mut b) => b,
X => fail!()
};
*a += 1;
*b += 1;
}
fn same_variant() {
let mut y = Y(1, 2);
let a = match y {
Y(ref mut a, _) => a,
X => fail!()
};
let b = match y {
Y(ref mut b, _) => b, //~ ERROR cannot borrow
X => fail!()
};
*a += 1;
*b += 1;
}
fn main() {
}