X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcDefaults.lhs;h=50b5767cef93614c00d88330f39d0e26931392bb;hp=43f23a329ed6cf4b991cdb46f5e460a9761e67a0;hb=HEAD;hpb=7fc749a43b4b6b85d234fa95d4928648259584f4

diff --git a/compiler/typecheck/TcDefaults.lhs b/compiler/typecheck/TcDefaults.lhs
index 43f23a3..50b5767 100644
--- a/compiler/typecheck/TcDefaults.lhs
+++ b/compiler/typecheck/TcDefaults.lhs
@@ -5,17 +5,8 @@
 \section[TcDefaults]{Typechecking \tr{default} declarations}
 
 \begin{code}
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
---     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
 module TcDefaults ( tcDefaults ) where
 
-#include "HsVersions.h"
-
 import HsSyn
 import Name
 import Class
@@ -27,8 +18,9 @@ import TcType
 import PrelNames
 import DynFlags
 import SrcLoc
-import Maybe
+import Data.Maybe
 import Outputable
+import FastString
 \end{code}
 
 \begin{code}
@@ -49,19 +41,19 @@ tcDefaults []
 	-- one group, only for the next group to ignore them and install
 	-- defaultDefaultTys
 
-tcDefaults [L locn (DefaultDecl [])]
-  = returnM (Just [])		-- Default declaration specifying no types
+tcDefaults [L _ (DefaultDecl [])]
+  = return (Just [])		-- Default declaration specifying no types
 
 tcDefaults [L locn (DefaultDecl mono_tys)]
   = setSrcSpan locn 			$
     addErrCtxt defaultDeclCtxt		$
-    do	{ ovl_str <- doptM Opt_OverloadedStrings
+    do	{ ovl_str <- xoptM Opt_OverloadedStrings
 	; num_class    <- tcLookupClass numClassName
 	; is_str_class <- tcLookupClass isStringClassName
 	; let deflt_clss | ovl_str   = [num_class, is_str_class]
 			 | otherwise = [num_class]
 
-	; tau_tys <- mappM (tc_default_ty deflt_clss) mono_tys
+	; tau_tys <- mapM (tc_default_ty deflt_clss) mono_tys
     
 	; return (Just tau_tys) }
 
@@ -70,6 +62,7 @@ tcDefaults decls@(L locn (DefaultDecl _) : _)
     failWithTc (dupDefaultDeclErr decls)
 
 
+tc_default_ty :: [Class] -> LHsType Name -> TcM Type
 tc_default_ty deflt_clss hs_ty 
  = do	{ ty <- tcHsSigType DefaultDeclCtxt hs_ty
 	; checkTc (isTauTy ty) (polyDefErr hs_ty)
@@ -83,22 +76,27 @@ check_instance :: Type -> Class -> TcM Bool
   -- Check that ty is an instance of cls
   -- We only care about whether it worked or not; return a boolean
 check_instance ty cls
-  = do	{ (_, mb_res) <- tryTc (tcSimplifyDefault [mkClassPred cls [ty]])
+  = do	{ (_, mb_res) <- tryTc (simplifyDefault [mkClassPred cls [ty]])
 	; return (isJust mb_res) }
     
-defaultDeclCtxt = ptext SLIT("When checking the types in a default declaration")
+defaultDeclCtxt :: SDoc
+defaultDeclCtxt = ptext (sLit "When checking the types in a default declaration")
 
+dupDefaultDeclErr :: [Located (DefaultDecl Name)] -> SDoc
 dupDefaultDeclErr (L _ (DefaultDecl _) : dup_things)
-  = hang (ptext SLIT("Multiple default declarations"))
-      4  (vcat (map pp dup_things))
+  = hang (ptext (sLit "Multiple default declarations"))
+       2 (vcat (map pp dup_things))
   where
-    pp (L locn (DefaultDecl _)) = ptext SLIT("here was another default declaration") <+> ppr locn
+    pp (L locn (DefaultDecl _)) = ptext (sLit "here was another default declaration") <+> ppr locn
+dupDefaultDeclErr [] = panic "dupDefaultDeclErr []"
 
+polyDefErr :: LHsType Name -> SDoc
 polyDefErr ty 
-  = hang (ptext SLIT("Illegal polymorphic type in default declaration") <> colon) 4 (ppr ty) 
+  = hang (ptext (sLit "Illegal polymorphic type in default declaration") <> colon) 2 (ppr ty) 
 
+badDefaultTy :: Type -> [Class] -> SDoc
 badDefaultTy ty deflt_clss
-  = hang (ptext SLIT("The default type") <+> quotes (ppr ty) <+> ptext SLIT("is not an instance of"))
-       2 (foldr1 (\a b -> a <+> ptext SLIT("or") <+> b) (map (quotes. ppr) deflt_clss))
+  = hang (ptext (sLit "The default type") <+> quotes (ppr ty) <+> ptext (sLit "is not an instance of"))
+       2 (foldr1 (\a b -> a <+> ptext (sLit "or") <+> b) (map (quotes. ppr) deflt_clss))
 \end{code}