X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcEnv.lhs;h=f1d14a5c9589b8508150f16959e842aa75c2b7c5;hb=fe58dd2f091f5a4a0e83a5ec6da643a6711e3aed;hp=4b5730b449a3a92965651e5a32ae05f5be285e59;hpb=a3bab0506498db41853543558c52a4fda0d183af;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcEnv.lhs b/compiler/typecheck/TcEnv.lhs
index 4b5730b..f1d14a5 100644
--- a/compiler/typecheck/TcEnv.lhs
+++ b/compiler/typecheck/TcEnv.lhs
@@ -203,6 +203,7 @@ tcLookupFamInst tycon tys
   = do { env <- getGblEnv
        ; eps <- getEps
        ; let instEnv = (eps_fam_inst_env eps, tcg_fam_inst_env env)
+       ; traceTc "lookupFamInst" ((ppr tycon <+> ppr tys) $$ ppr instEnv)
        ; case lookupFamInstEnv instEnv tycon tys of
 	   []                      -> return Nothing
 	   ((fam_inst, rep_tys):_) 
@@ -625,7 +626,8 @@ data InstBindings a
 			-- witness dictionary is identical to the argument 
 			-- dictionary.  Hence no bindings, no pragmas.
 
-	CoercionI	-- The coercion maps from newtype to the representation type
+          -- BAY* : should this be a CoAxiom?
+	Coercion	-- The coercion maps from newtype to the representation type
 			-- (mentioning type variables bound by the forall'd iSpec variables)
 			-- E.g.   newtype instance N [a] = N1 (Tree a)
 			-- 	  co : N [a] ~ Tree a
@@ -637,7 +639,13 @@ data InstBindings a
                         -- in TcDeriv
 
 pprInstInfo :: InstInfo a -> SDoc
-pprInstInfo info = vcat [ptext (sLit "InstInfo:") <+> ppr (idType (iDFunId info))]
+pprInstInfo info = hang (ptext (sLit "instance"))
+                      2 (sep [ ifPprDebug (pprForAll tvs)
+                             , pprThetaArrowTy theta, ppr tau
+                             , ptext (sLit "where")])
+  where
+    (tvs, theta, tau) = tcSplitSigmaTy (idType (iDFunId info))
+
 
 pprInstInfoDetails :: OutputableBndr a => InstInfo a -> SDoc
 pprInstInfoDetails info = pprInstInfo info $$ nest 2 (details (iBinds info))