X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FhsSyn%2FHsUtils.lhs;h=be4431d234157630397feae55c1a9ddb95abe36a;hp=5d7132ec74399dccfd54752de134ba4f18b925b6;hb=ab22f4e6456820c1b5169d75f5975a94e61f54ce;hpb=190f24892156953d73b55401d0467a6f1a88ce5d

diff --git a/compiler/hsSyn/HsUtils.lhs b/compiler/hsSyn/HsUtils.lhs
index 5d7132e..be4431d 100644
--- a/compiler/hsSyn/HsUtils.lhs
+++ b/compiler/hsSyn/HsUtils.lhs
@@ -1,5 +1,5 @@
 %
-% (c) The University of Glasgow, 1992-2003
+% (c) The University of Glasgow, 1992-2006
 %
 
 Here we collect a variety of helper functions that construct or
@@ -24,17 +24,17 @@ import HsTypes
 import HsLit
 import HsDecls
 
-import RdrName		( RdrName, getRdrName, mkRdrUnqual )
-import Var		( Id )
-import Type		( Type )
-import DataCon		( DataCon, dataConWrapId, dataConSourceArity )
-import OccName		( mkVarOccFS )
-import Name		( Name )
-import BasicTypes	( RecFlag(..) )
+import RdrName
+import Var
+import Type
+import DataCon
+import OccName
+import Name
+import BasicTypes
 import SrcLoc
-import FastString	( mkFastString )
+import FastString
 import Outputable
-import Util		( nOfThem )
+import Util
 import Bag
 \end{code}
 
@@ -428,7 +428,10 @@ collect_pat other	        acc = acc 	-- Literals, vars, wildcard
 
 getMainDeclBinder :: HsDecl name -> Maybe name
 getMainDeclBinder (TyClD d) = Just (tcdName d)
-getMainDeclBinder (ValD d) = Just ((unLoc . head) (collectAcc d []))
+getMainDeclBinder (ValD d)
+   = case collectAcc d [] of
+        []       -> Nothing   -- see rn003
+        (name:_) -> Just (unLoc name)
 getMainDeclBinder (SigD d) = sigNameNoLoc d
 getMainDeclBinder (ForD (ForeignImport name _ _)) = Just (unLoc name)
 getMainDeclBinder (ForD (ForeignExport name _ _)) = Just (unLoc name)