diff --git a/ghc/tests/typecheck/should_fail/tcfail087.hs b/ghc/tests/typecheck/should_fail/tcfail087.hs
new file mode 100644
index 0000000000000000000000000000000000000000..c81f155d01e90345b3112deb6d9713ecdc7976a4
--- /dev/null
+++ b/ghc/tests/typecheck/should_fail/tcfail087.hs
@@ -0,0 +1,13 @@
+{-# OPTIONS -fglasgow-exts #-}
+
+-- !!! Check that unboxed tuples can't be function arguments
+module ShouldFail where
+
+data Ex = Ex (# Int,Int #)
+
+f :: (# Int,Int #) -> Int
+f x = error "urk"
+
+g (# x,y #) = x
+
+
diff --git a/ghc/tests/typecheck/should_fail/tcfail087.stderr b/ghc/tests/typecheck/should_fail/tcfail087.stderr
new file mode 100644
index 0000000000000000000000000000000000000000..8d1c8b69c3fce7bea45c73efd06983e3c419a92f
--- /dev/null
+++ b/ghc/tests/typecheck/should_fail/tcfail087.stderr
@@ -0,0 +1 @@
+