Remove unused imports

[ghc-hetmet.git] / compiler / typecheck / TcHsSyn.lhs

diff --git a/compiler/typecheck/TcHsSyn.lhs b/compiler/typecheck/TcHsSyn.lhs
index fe9c808..7b88356 100644 (file)
--- a/compiler/typecheck/TcHsSyn.lhs
+++ b/compiler/typecheck/TcHsSyn.lhs
@@ -35,7 +35,6 @@ import Id
 
 import TcRnMonad
 import PrelNames
-import Type
 import TcType
 import TcMType
 import TysPrim
@@ -49,7 +48,6 @@ import VarEnv
 import Literal
 import BasicTypes
 import Maybes
-import Unique
 import SrcLoc
 import Util
 import Bag
@@ -251,11 +249,22 @@ zonkDictBndrs :: ZonkEnv -> [Var] -> TcM [Var]
 zonkDictBndrs env ids = mappM (zonkDictBndr env) ids
 
 zonkDictBndr :: ZonkEnv -> Var -> TcM Var
-zonkDictBndr env var | isTyVar var = return var
+zonkDictBndr env var | isTyVar var = zonkTyVarBndr env var
                     | otherwise   = zonkIdBndr env var
 
 zonkTopBndrs :: [TcId] -> TcM [Id]
 zonkTopBndrs ids = zonkIdBndrs emptyZonkEnv ids
+
+-- Zonk the kind of a non-TC tyvar in case it is a coercion variable (their
+-- kind contains types).
+--
+zonkTyVarBndr :: ZonkEnv -> TyVar -> TcM TyVar
+zonkTyVarBndr env tv
+  | isCoVar tv
+  = do { kind <- zonkTcTypeToType env (tyVarKind tv)
+       ; return $ setTyVarKind tv kind
+       }
+  | otherwise = return tv
 \end{code}
 
 
@@ -607,7 +616,8 @@ zonkCoFn env (WpLam id)     = do { id' <- zonkDictBndr env id
                                 ; let env1 = extendZonkEnv1 env id'
                                 ; return (env1, WpLam id') }
 zonkCoFn env (WpTyLam tv)   = ASSERT( isImmutableTyVar tv )
-                             return (env, WpTyLam tv)
+                              do { tv' <- zonkTyVarBndr env tv
+                                ; return (env, WpTyLam tv') }
 zonkCoFn env (WpApp v)
        | isTcTyVar v       = do { co <- zonkTcTyVar v
                                 ; return (env, WpTyApp co) }
@@ -754,9 +764,9 @@ zonkRecFields env (HsRecFields flds dd)
        ; return (HsRecFields flds' dd) }
   where
     zonk_rbind fld
-      = do { new_expr <- zonkLExpr env (hsRecFieldArg fld)
-          ; return (fld { hsRecFieldArg = new_expr }) }
-       -- Field selectors have declared types; hence no zonking
+      = do { new_id   <- wrapLocM (zonkIdBndr env) (hsRecFieldId fld)
+          ; new_expr <- zonkLExpr env (hsRecFieldArg fld)
+          ; return (fld { hsRecFieldId = new_id, hsRecFieldArg = new_expr }) }
 
 -------------------------------------------------------------------------
 mapIPNameTc :: (a -> TcM b) -> IPName a -> TcM (IPName b)
@@ -811,7 +821,8 @@ zonk_pat env (AsPat (L loc v) pat)
 zonk_pat env (ViewPat expr pat ty)
   = do { expr' <- zonkLExpr env expr
        ; (env', pat') <- zonkPat env pat
-       ; return (env', ViewPat expr' pat' ty) }
+       ; ty' <- zonkTcTypeToType env ty
+       ; return (env', ViewPat expr' pat' ty') }
 
 zonk_pat env (ListPat pats ty)
   = do { ty' <- zonkTcTypeToType env ty
@@ -1059,7 +1070,7 @@ mkArbitraryType warn tv
   , isLiftedTypeKind res                       --    Horrible hack to make less use 
   = return (mkTyConApp tup_tc [])              --    of mkAnyPrimTyCon
   | otherwise
-  = do { warn (getSrcSpan tv) msg
+  = do { _ <- warn (getSrcSpan tv) msg
        ; return (mkTyConApp (mkAnyPrimTyCon (getUnique tv) kind) []) }
                -- Same name as the tyvar, apart from making it start with a colon (sigh)
                -- I dread to think what will happen if this gets out into an