Add some type signatures

diff --git a/compiler/typecheck/TcType.lhs b/compiler/typecheck/TcType.lhs
index 04f50d3..a21f0fb 100644 (file)
--- a/compiler/typecheck/TcType.lhs
+++ b/compiler/typecheck/TcType.lhs
@@ -540,6 +540,7 @@ isIndirect other        = False
 %************************************************************************
 
 \begin{code}
 %************************************************************************
 
 \begin{code}

+mkSigmaTy :: [TyVar] -> [PredType] -> Type -> Type

 mkSigmaTy tyvars theta tau = mkForAllTys tyvars (mkPhiTy theta tau)
 
 mkPhiTy :: [PredType] -> Type -> Type
 mkSigmaTy tyvars theta tau = mkForAllTys tyvars (mkPhiTy theta tau)
 
 mkPhiTy :: [PredType] -> Type -> Type

@@ -620,15 +621,15 @@ tcIsForAllTy ty | Just ty' <- tcView ty = tcIsForAllTy ty'
 tcIsForAllTy (ForAllTy tv ty) = True
 tcIsForAllTy t               = False
 
 tcIsForAllTy (ForAllTy tv ty) = True
 tcIsForAllTy t               = False
 

-tcSplitPhiTy :: Type -> ([PredType], Type)
+tcSplitPhiTy :: Type -> (ThetaType, Type)

 tcSplitPhiTy ty = split ty ty []
  where
   split orig_ty ty tvs | Just ty' <- tcView ty = split orig_ty ty' tvs
 tcSplitPhiTy ty = split ty ty []
  where
   split orig_ty ty tvs | Just ty' <- tcView ty = split orig_ty ty' tvs

-  split orig_ty (FunTy arg res) ts = case tcSplitPredTy_maybe arg of
-                                       Just p  -> split res res (p:ts)
-                                       Nothing -> (reverse ts, orig_ty)
+  split orig_ty (FunTy arg res) ts 
+       | Just p <- tcSplitPredTy_maybe arg = split res res (p:ts)

   split orig_ty ty             ts = (reverse ts, orig_ty)
 
   split orig_ty ty             ts = (reverse ts, orig_ty)
 

+tcSplitSigmaTy :: Type -> ([TyVar], ThetaType, Type)

 tcSplitSigmaTy ty = case tcSplitForAllTys ty of
                        (tvs, rho) -> case tcSplitPhiTy rho of
                                        (theta, tau) -> (tvs, theta, tau)
 tcSplitSigmaTy ty = case tcSplitForAllTys ty of
                        (tvs, rho) -> case tcSplitPhiTy rho of
                                        (theta, tau) -> (tvs, theta, tau)