diff --git a/ghc/tests/typecheck/should_compile/tc106.hs b/ghc/tests/typecheck/should_compile/tc106.hs
new file mode 100644
index 0000000000000000000000000000000000000000..aa9a7f804de519eb06a744aafcdaa058fc5202ad
--- /dev/null
+++ b/ghc/tests/typecheck/should_compile/tc106.hs
@@ -0,0 +1,12 @@
+{-# OPTIONS -fglasgow-exts #-}
+
+-- !!! Mutually recursive kind inference
+
+module ShouldCompile where
+
+class Lookup c k a where
+    lookupAll :: Sequence seq a => c -> k -> seq a
+
+class Lookup (s a) Int a => Sequence s a where
+    foo :: s a
+
diff --git a/ghc/tests/typecheck/should_compile/tc106.stderr b/ghc/tests/typecheck/should_compile/tc106.stderr
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391