1 files changed, 49 insertions, 0 deletions
diff --git a/tests/ui/generator/issue-105084.rs b/tests/ui/generator/issue-105084.rs
new file mode 100644
index 000000000..7c9a97b40
--- /dev/null
+++ b/tests/ui/generator/issue-105084.rs
@@ -0,0 +1,49 @@
+// revisions: no_drop_tracking drop_tracking drop_tracking_mir
+// [drop_tracking] compile-flags: -Zdrop-tracking
+// [drop_tracking_mir] compile-flags: -Zdrop-tracking-mir
+// [no_drop_tracking] known-bug: #105084
+// [no_drop_tracking] check-pass
+// [drop_tracking] known-bug: #105084
+// [drop_tracking] check-pass
+
+#![feature(generators)]
+#![feature(generator_clone)]
+#![feature(generator_trait)]
+#![feature(box_syntax)]
+
+use std::ops::Generator;
+use std::pin::Pin;
+
+fn copy<T: Copy>(x: T) -> T {
+    x
+}
+
+fn main() {
+    let mut g = || {
+        // This is desuraged as 4 stages:
+        // - allocate a `*mut u8` with `exchange_malloc`;
+        // - create a Box that is ignored for trait computations;
+        // - compute fields (and yields);
+        // - assign to `t`.
+        let t = box (5, yield);
+        drop(t);
+    };
+
+    // Allocate the temporary box.
+    Pin::new(&mut g).resume(());
+
+    // The temporary box is in generator locals.
+    // As it is not taken into account for trait computation,
+    // the generator is `Copy`.
+    let mut h = copy(g);
+    //[drop_tracking_mir]~^ ERROR the trait bound `Box<(i32, ())>: Copy` is not satisfied in
+
+    // We now have 2 boxes with the same backing allocation:
+    // one inside `g` and one inside `h`.
+    // Proceed and drop `t` in `g`.
+    Pin::new(&mut g).resume(());
+    //[drop_tracking_mir]~^ ERROR borrow of moved value: `g`
+
+    // Proceed and drop `t` in `h` -> double free!
+    Pin::new(&mut h).resume(());
+}