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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs')
-rw-r--r-- | tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs b/tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs new file mode 100644 index 000000000..6a38764a1 --- /dev/null +++ b/tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs @@ -0,0 +1,34 @@ +// run-pass +// Test when destructors run in a for loop. The intention is +// that the value for each iteration is dropped *after* the loop +// body has executed. This is true even when the value is assigned +// to a `_` pattern (and hence ignored). + +use std::cell::Cell; + +struct Flag<'a>(&'a Cell<bool>); + +impl<'a> Drop for Flag<'a> { + fn drop(&mut self) { + self.0.set(false) + } +} + +fn main() { + let alive2 = Cell::new(true); + for _i in std::iter::once(Flag(&alive2)) { + // The Flag value should be alive in the for loop body + assert_eq!(alive2.get(), true); + } + // The Flag value should be dead outside of the loop + assert_eq!(alive2.get(), false); + + let alive = Cell::new(true); + for _ in std::iter::once(Flag(&alive)) { + // The Flag value should be alive in the for loop body even if it wasn't + // bound by the for loop + assert_eq!(alive.get(), true); + } + // The Flag value should be dead outside of the loop + assert_eq!(alive.get(), false); +} |