1 files changed, 17 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-33687.rs b/tests/ui/issues/issue-33687.rs
new file mode 100644
index 000000000..ac802ed86
--- /dev/null
+++ b/tests/ui/issues/issue-33687.rs
@@ -0,0 +1,17 @@
+// run-pass
+#![feature(unboxed_closures)]
+#![feature(fn_traits)]
+
+struct Test;
+
+impl FnOnce<(u32, u32)> for Test {
+    type Output = u32;
+
+    extern "rust-call" fn call_once(self, (a, b): (u32, u32)) -> u32 {
+        a + b
+    }
+}
+
+fn main() {
+    assert_eq!(Test(1u32, 2u32), 3u32);
+}