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70 lines
1.9 KiB
Rust
70 lines
1.9 KiB
Rust
// run-pass
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// needs-unwind
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// Check that partially moved from function parameters are dropped after the
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// named bindings that move from them.
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use std::{panic, cell::RefCell};
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struct LogDrop<'a>(i32, Context<'a>);
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#[derive(Copy, Clone)]
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struct Context<'a> {
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panic_on: i32,
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drops: &'a RefCell<Vec<i32>>,
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}
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impl<'a> Context<'a> {
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fn record_drop(self, index: i32) {
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self.drops.borrow_mut().push(index);
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if index == self.panic_on {
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panic!();
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}
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}
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}
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impl<'a> Drop for LogDrop<'a> {
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fn drop(&mut self) {
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self.1.record_drop(self.0);
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}
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}
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fn bindings_in_params((_x, _): (LogDrop, LogDrop), (_, _y): (LogDrop, LogDrop)) {}
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fn bindings_with_let(a: (LogDrop, LogDrop), b: (LogDrop, LogDrop)) {
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// Drop order in foo is the same as the following bindings.
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// _temp2 is declared after _x to avoid a difference between `_: T` and
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// `x: T` in function parameters.
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let _temp1 = a;
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let (_x, _) = _temp1;
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let _temp2 = b;
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let (_, _y) = _temp2;
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}
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fn test_drop_order(panic_on: i32, fun: fn((LogDrop, LogDrop), (LogDrop, LogDrop))) {
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let context = Context {
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panic_on,
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drops: &RefCell::new(Vec::new()),
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};
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let one = LogDrop(1, context);
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let two = LogDrop(2, context);
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let three = LogDrop(3, context);
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let four = LogDrop(4, context);
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let res = panic::catch_unwind(panic::AssertUnwindSafe(|| {
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fun((three, four), (two, one));
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}));
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if panic_on == 0 {
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assert!(res.is_ok(), "should not have panicked");
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} else {
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assert!(res.is_err(), "should have panicked");
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}
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assert_eq!(*context.drops.borrow(), [1, 2, 3, 4], "incorrect drop order");
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}
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fn main() {
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(0..=4).for_each(|i| test_drop_order(i, bindings_in_params));
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(0..=4).for_each(|i| test_drop_order(i, bindings_with_let));
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(0..=4).for_each(|i| test_drop_order(i, |(_x, _), (_, _y)| {}));
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}
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