mirror of https://github.com/rust-lang/rust
60 lines
1.1 KiB
Rust
60 lines
1.1 KiB
Rust
// check drop order of temporaries create in match guards.
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// For normal guards all temporaries are dropped before the body of the arm.
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// For let guards temporaries live until the end of the arm.
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//@ run-pass
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#![feature(if_let_guard)]
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#![allow(irrefutable_let_patterns)]
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use std::sync::Mutex;
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static A: Mutex<Vec<i32>> = Mutex::new(Vec::new());
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struct D(i32);
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fn make_d(x: i32) -> D {
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A.lock().unwrap().push(x);
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D(x)
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}
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impl Drop for D {
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fn drop(&mut self) {
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A.lock().unwrap().push(!self.0);
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}
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}
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fn if_guard(num: i32) {
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let _d = make_d(1);
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match num {
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1 | 2 if make_d(2).0 == 2 => {
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make_d(3);
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}
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_ => {}
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}
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}
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fn if_let_guard(num: i32) {
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let _d = make_d(1);
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match num {
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1 | 2 if let D(ref _x) = make_d(2) => {
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make_d(3);
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}
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_ => {}
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}
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}
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fn main() {
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if_guard(1);
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if_guard(2);
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if_let_guard(1);
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if_let_guard(2);
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let expected = [
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1, 2, !2, 3, !3, !1,
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1, 2, !2, 3, !3, !1,
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1, 2, 3, !3, !2, !1,
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1, 2, 3, !3, !2, !1,
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];
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assert_eq!(*A.lock().unwrap(), expected);
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}
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