X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcEnv.lhs;h=a087059926fcba10fa8f56687272d4b82f5ecfa9;hp=d6177b403e4aec06a63993d4358b22cdbee0fd71;hb=c8c2f6bb7d79a2a6aeaa3233363fdf0bbbfad205;hpb=d2ce0f52d42edf32bb9f13796e6ba6edba8bd516

diff --git a/compiler/typecheck/TcEnv.lhs b/compiler/typecheck/TcEnv.lhs
index d6177b4..a087059 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):_) 
@@ -548,9 +549,9 @@ tcGetDefaultTys :: Bool		-- True <=> interactive context
                          Bool)) -- True <=> Use extended defaulting rules
 tcGetDefaultTys interactive
   = do	{ dflags <- getDOpts
-        ; let ovl_strings = dopt Opt_OverloadedStrings dflags
+        ; let ovl_strings = xopt Opt_OverloadedStrings dflags
               extended_defaults = interactive
-                               || dopt Opt_ExtendedDefaultRules dflags
+                               || xopt Opt_ExtendedDefaultRules dflags
 				        -- See also Trac #1974 
               flags = (ovl_strings, extended_defaults)
     
@@ -606,8 +607,8 @@ as well as explicit user written ones.
 \begin{code}
 data InstInfo a
   = InstInfo {
-      iSpec  :: Instance,		-- Includes the dfun id.  Its forall'd type 
-      iBinds :: InstBindings a		-- variables scope over the stuff in InstBindings!
+      iSpec   :: Instance,        -- Includes the dfun id.  Its forall'd type
+      iBinds  :: InstBindings a   -- variables scope over the stuff in InstBindings!
     }
 
 iDFunId :: InstInfo a -> DFunId
@@ -625,7 +626,7 @@ 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
+	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 +638,13 @@ 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))