1 files changed, 44 insertions, 0 deletions
diff --git a/tests/ui/swap-overlapping.rs b/tests/ui/swap-overlapping.rs
new file mode 100644
index 00000000000..85b357e0c02
--- /dev/null
+++ b/tests/ui/swap-overlapping.rs
@@ -0,0 +1,44 @@
+// run-pass
+
+#![allow(dead_code)]
+// Issue #5041 - avoid overlapping memcpy when src and dest of a swap are the same
+
+// pretty-expanded FIXME #23616
+
+use std::ptr;
+
+pub fn main() {
+    let mut test = TestDescAndFn {
+        desc: TestDesc {
+            name: TestName::DynTestName("test".to_string()),
+            should_fail: false
+        },
+        testfn: TestFn::DynTestFn(22),
+    };
+    do_swap(&mut test);
+}
+
+fn do_swap(test: &mut TestDescAndFn) {
+    unsafe {
+        ptr::swap(test, test);
+    }
+}
+
+pub enum TestName {
+    DynTestName(String)
+}
+
+pub enum TestFn {
+    DynTestFn(isize),
+    DynBenchFn(isize),
+}
+
+pub struct TestDesc {
+    name: TestName,
+    should_fail: bool
+}
+
+pub struct TestDescAndFn {
+    desc: TestDesc,
+    testfn: TestFn,
+}