--- /dev/null
+\begin{code}
+module TcUnify where
+import TcType ( TcTauType, BoxyType )
+import TcRnTypes( TcM )
+
+-- This boot file exists only to tie the knot between
+-- TcUnify and TcSimplify
+
+unifyType :: TcTauType -> TcTauType -> TcM ()
+zapToMonotype :: BoxyType -> TcM TcTauType
+\end{code}