X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcEnv.lhs;h=b3e0d7fdea0b78144fa2efd2ca60dca8cf91309b;hb=5d541fe7c43a1dc4c1b2dd9ee49e64238b0754ca;hp=19deca9e4c1eb4c43d0270bae916f1f9f8cf1f8b;hpb=3e83dfb21b2f2220dce97427fff5c19459ae68d1;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcEnv.lhs b/compiler/typecheck/TcEnv.lhs
index 19deca9..b3e0d7f 100644
--- a/compiler/typecheck/TcEnv.lhs
+++ b/compiler/typecheck/TcEnv.lhs
@@ -565,7 +565,9 @@ data InstBindings
 	[LSig Name]		-- User pragmas recorded for generating 
 				-- specialised instances
 
-  | NewTypeDerived 		-- Used for deriving instances of newtypes, where the
+  | NewTypeDerived 		
+        TyCon                   -- tycon for the newtype
+                                -- Used for deriving instances of newtypes, where the
 	[Type]			-- witness dictionary is identical to the argument 
 				-- dictionary.  Hence no bindings, no pragmas
 	-- The [Type] are the representation types
@@ -576,7 +578,7 @@ pprInstInfo info = vcat [ptext SLIT("InstInfo:") <+> ppr (idType (iDFunId info))
 pprInstInfoDetails info = pprInstInfo info $$ nest 2 (details (iBinds info))
   where
     details (VanillaInst b _)  = pprLHsBinds b
-    details (NewTypeDerived _) = text "Derived from the representation type"
+    details (NewTypeDerived _  _) = text "Derived from the representation type"
 
 simpleInstInfoClsTy :: InstInfo -> (Class, Type)
 simpleInstInfoClsTy info = case instanceHead (iSpec info) of