\begin{code}
module TcUnify where
import TcType	( TcTauType, BoxySigmaType, BoxyType )
import TcRnTypes( TcM )
import Coercion (CoercionI)

-- This boot file exists only to tie the knot between
--		TcUnify and TcSimplify

unifyType :: TcTauType -> TcTauType -> TcM CoercionI
boxyUnify :: BoxyType -> BoxyType -> TcM CoercionI
zapToMonotype :: BoxySigmaType -> TcM TcTauType
\end{code}