X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FdeSugar%2FMatchCon.lhs;h=4e9ee8e3f7c567895b0cc861cdb751e29a2d1190;hb=e4417dcd4679da9c6b18c02ff667199c572bed89;hp=ed9f2c12047264a35a9817b3bc2c528dd8905f3f;hpb=2eb04ca0f8d0ec72b417cddc60672c696b4a3daa;p=ghc-hetmet.git

diff --git a/compiler/deSugar/MatchCon.lhs b/compiler/deSugar/MatchCon.lhs
index ed9f2c1..4e9ee8e 100644
--- a/compiler/deSugar/MatchCon.lhs
+++ b/compiler/deSugar/MatchCon.lhs
@@ -6,6 +6,13 @@
 Pattern-matching constructors
 
 \begin{code}
+{-# OPTIONS -fno-warn-incomplete-patterns #-}
+-- 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 MatchCon ( matchConFamily ) where
 
 #include "HsVersions.h"
@@ -22,6 +29,7 @@ import DsMonad
 import DsUtils
 import Util	( takeList )
 import Id
+import Var      (TyVar)
 import SrcLoc
 import Outputable
 \end{code}
@@ -86,6 +94,10 @@ matchConFamily (var:vars) ty groups
   = do	{ alts <- mapM (matchOneCon vars ty) groups
 	; return (mkCoAlgCaseMatchResult var ty alts) }
 
+matchOneCon :: [Id]
+            -> Type
+            -> [EquationInfo]
+            -> DsM (DataCon, [TyVar], MatchResult)
 matchOneCon vars ty (eqn1 : eqns)	-- All eqns for a single constructor
   = do	{ (wraps, eqns') <- mapAndUnzipM shift (eqn1:eqns)
 	; arg_vars <- selectMatchVars (take (dataConSourceArity con1) 
@@ -121,9 +133,9 @@ conArgPats :: DataCon
 			-- are probably never looked at anyway
 	   -> HsConDetails (LPat Id) (HsRecFields Id (LPat Id))
 	   -> [Pat Id]
-conArgPats data_con arg_tys (PrefixCon ps)   = map unLoc ps
-conArgPats data_con arg_tys (InfixCon p1 p2) = [unLoc p1, unLoc p2]
-conArgPats data_con arg_tys (RecCon (HsRecFields rpats _))
+conArgPats _data_con _arg_tys (PrefixCon ps)   = map unLoc ps
+conArgPats _data_con _arg_tys (InfixCon p1 p2) = [unLoc p1, unLoc p2]
+conArgPats  data_con  arg_tys (RecCon (HsRecFields rpats _))
   | null rpats
   =	-- Special case for C {}, which can be used for 
 	-- a constructor that isn't declared to have