summaryrefslogtreecommitdiffstats
path: root/src/test/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
commit698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch)
tree173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs
parentInitial commit. (diff)
downloadrustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz
rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs')
-rw-r--r--src/test/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs34
1 files changed, 34 insertions, 0 deletions
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<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);
+}