1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/tuple/builtin-fail.rs b/tests/ui/tuple/builtin-fail.rs
new file mode 100644
index 00000000000..31208096151
--- /dev/null
+++ b/tests/ui/tuple/builtin-fail.rs
@@ -0,0 +1,19 @@
+#![feature(tuple_trait)]
+
+fn assert_is_tuple<T: std::marker::Tuple + ?Sized>() {}
+
+struct TupleStruct(i32, i32);
+
+fn from_param_env<T>() {
+    assert_is_tuple::<T>();
+    //~^ ERROR `T` is not a tuple
+}
+
+fn main() {
+    assert_is_tuple::<i32>();
+    //~^ ERROR `i32` is not a tuple
+    assert_is_tuple::<(i32)>();
+    //~^ ERROR `i32` is not a tuple
+    assert_is_tuple::<TupleStruct>();
+    //~^ ERROR `TupleStruct` is not a tuple
+}