Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/test/ui/zero-sized/zero-sized-linkedlist-push.rs b/src/test/ui/zero-sized/zero-sized-linkedlist-push.rs
new file mode 100644
index 000000000..03724085f
--- /dev/null
+++ b/src/test/ui/zero-sized/zero-sized-linkedlist-push.rs
@@ -0,0 +1,29 @@
+// run-pass
+use std::collections::LinkedList;
+use std::iter::Iterator;
+
+fn main() {
+    const N: usize = 8;
+
+    // Test that for all possible sequences of push_front / push_back,
+    // we end up with a LinkedList of the correct size
+
+    for len in 0..N {
+        let mut tester = LinkedList::new();
+        assert_eq!(tester.len(), 0);
+        assert_eq!(tester.front(), None);
+        for case in 0..(1 << len) {
+            assert_eq!(tester.len(), 0);
+            for bit in 0..len {
+                if case & (1 << bit) != 0 {
+                    tester.push_front(());
+                } else {
+                    tester.push_back(());
+                }
+            }
+            assert_eq!(tester.len(), len);
+            assert_eq!(tester.iter().count(), len);
+            tester.clear();
+        }
+    }
+}