1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/generator/not-send-sync.rs b/tests/ui/generator/not-send-sync.rs
new file mode 100644
index 00000000000..8ca5565fb2a
--- /dev/null
+++ b/tests/ui/generator/not-send-sync.rs
@@ -0,0 +1,21 @@
+#![feature(generators)]
+
+use std::cell::Cell;
+
+fn main() {
+    fn assert_sync<T: Sync>(_: T) {}
+    fn assert_send<T: Send>(_: T) {}
+
+    assert_sync(|| {
+        //~^ ERROR: generator cannot be shared between threads safely
+        let a = Cell::new(2);
+        yield;
+    });
+
+    let a = Cell::new(2);
+    assert_send(|| {
+        //~^ ERROR: E0277
+        drop(&a);
+        yield;
+    });
+}