From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- .../for-loop-lifetime-of-unbound-values.rs | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 src/test/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs (limited to 'src/test/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs') diff --git a/src/test/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs b/src/test/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs new file mode 100644 index 000000000..6a38764a1 --- /dev/null +++ b/src/test/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); + +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); +} -- cgit v1.2.3