80 lines
2.3 KiB
Rust
80 lines
2.3 KiB
Rust
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// run-pass
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// This test checks the dynamic semantics and drop order of pattern matching
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// where a product pattern has both a by-move and by-ref binding.
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use std::cell::RefCell;
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use std::rc::Rc;
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struct X {
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x: Box<usize>,
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d: DropOrderListPtr,
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}
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type DropOrderListPtr = Rc<RefCell<Vec<usize>>>;
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impl Drop for X {
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fn drop(&mut self) {
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self.d.borrow_mut().push(*self.x);
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}
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}
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enum DoubleOption<T, U> {
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Some2(T, U),
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_None2,
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}
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fn main() {
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let d: DropOrderListPtr = <_>::default();
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{
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let mk = |v| X { x: Box::new(v), d: d.clone() };
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let check = |a1: &X, a2, b1: &X, b2| {
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assert_eq!(*a1.x, a2);
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assert_eq!(*b1.x, b2);
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};
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let x = DoubleOption::Some2(mk(1), mk(2));
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match x {
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DoubleOption::Some2(ref a, b) => check(a, 1, &b, 2),
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DoubleOption::_None2 => panic!(),
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}
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let x = DoubleOption::Some2(mk(3), mk(4));
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match x {
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DoubleOption::Some2(a, ref b) => check(&a, 3, b, 4),
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DoubleOption::_None2 => panic!(),
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}
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match DoubleOption::Some2(mk(5), mk(6)) {
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DoubleOption::Some2(ref a, b) => check(a, 5, &b, 6),
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DoubleOption::_None2 => panic!(),
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}
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match DoubleOption::Some2(mk(7), mk(8)) {
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DoubleOption::Some2(a, ref b) => check(&a, 7, b, 8),
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DoubleOption::_None2 => panic!(),
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}
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{
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let (a, ref b) = (mk(9), mk(10));
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let (ref c, d) = (mk(11), mk(12));
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check(&a, 9, b, 10);
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check(c, 11, &d, 12);
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}
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fn fun([a, ref mut b, ref xs @ .., ref c, d]: [X; 6]) {
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assert_eq!(*a.x, 13);
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assert_eq!(*b.x, 14);
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assert_eq!(&[*xs[0].x, *xs[1].x], &[15, 16]);
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assert_eq!(*c.x, 17);
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assert_eq!(*d.x, 18);
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}
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fun([mk(13), mk(14), mk(15), mk(16), mk(17), mk(18)]);
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let lam = |(a, ref b, c, ref mut d): (X, X, X, X)| {
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assert_eq!(*a.x, 19);
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assert_eq!(*b.x, 20);
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assert_eq!(*c.x, 21);
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assert_eq!(*d.x, 22);
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};
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lam((mk(19), mk(20), mk(21), mk(22)));
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}
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let expected = [2, 3, 6, 5, 7, 8, 12, 11, 9, 10, 18, 13, 14, 15, 16, 17, 21, 19, 20, 22, 4, 1];
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assert_eq!(&*d.borrow(), &expected);
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}
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