1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/kindck/kindck-send-object.rs b/src/test/ui/kindck/kindck-send-object.rs
new file mode 100644
index 000000000..6411e688b
--- /dev/null
+++ b/src/test/ui/kindck/kindck-send-object.rs
@@ -0,0 +1,26 @@
+// Test which of the builtin types are considered sendable. The tests
+// in this file all test the "kind" violates detected during kindck.
+// See all `regions-bounded-by-send.rs`
+
+fn assert_send<T:Send>() { }
+trait Dummy { }
+trait Message : Send { }
+
+// careful with object types, who knows what they close over...
+
+fn object_ref_with_static_bound_not_ok() {
+    assert_send::<&'static (dyn Dummy + 'static)>();
+    //~^ ERROR `(dyn Dummy + 'static)` cannot be shared between threads safely [E0277]
+}
+
+fn box_object_with_no_bound_not_ok<'a>() {
+    assert_send::<Box<dyn Dummy>>();
+    //~^ ERROR `dyn Dummy` cannot be sent between threads safely
+}
+
+fn object_with_send_bound_ok() {
+    assert_send::<&'static (dyn Dummy + Sync)>();
+    assert_send::<Box<dyn Dummy + Send>>();
+}
+
+fn main() { }