X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Ftypecheck%2FFamInst.lhs;h=89dffbf8c5111fdf1786ffb8d69cc677ac68d3d0;hp=eed79ca2c7c121a31f9f18528bcc24d1292e02f3;hb=bb7ffa1642e2110e26e1243c42a8a24adafa985d;hpb=edaf4b7be527a8c029f4f3855b57d538d764b500

diff --git a/compiler/typecheck/FamInst.lhs b/compiler/typecheck/FamInst.lhs
index eed79ca..89dffbf 100644
--- a/compiler/typecheck/FamInst.lhs
+++ b/compiler/typecheck/FamInst.lhs
@@ -1,13 +1,6 @@
 The @FamInst@ type: family instance heads
 
 \begin{code}
-{-# OPTIONS -w #-}
--- 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 FamInst ( 
         checkFamInstConsistency, tcExtendLocalFamInstEnv
     ) where
@@ -180,7 +173,7 @@ checkForConflicts inst_envs famInst
 		         Nothing        -> panic "FamInst.checkForConflicts"
 		         Just (tc, tys) -> tc `mkTyConApp` tys
              }
-       ; (tvs', _, tau') <- tcInstSkolType FamInstSkol ty
+       ; (_, _, tau') <- tcInstSkolType FamInstSkol ty
 
        ; let (fam, tys') = tcSplitTyConApp tau'
 
@@ -194,9 +187,9 @@ checkForConflicts inst_envs famInst
 	   conflictInstErr famInst (head conflicts)
        }
   where
-      -- * In the case of data family instances, any overlap is fundamentally a 
+      -- - In the case of data family instances, any overlap is fundamentally a
       --   conflict (as these instances imply injective type mappings).
-      -- * In the case of type family instances, overlap is admitted as long as 
+      -- - In the case of type family instances, overlap is admitted as long as
       --   the right-hand sides of the overlapping rules coincide under the
       --   overlap substitution.  We require that they are syntactically equal;
       --   anything else would be difficult to test for at this stage.
@@ -208,11 +201,13 @@ checkForConflicts inst_envs famInst
         rhs1   = substTy subst $ synTyConType tycon1
         rhs2   = substTy subst $ synTyConType tycon2
 
+conflictInstErr :: FamInst -> FamInst -> TcRn ()
 conflictInstErr famInst conflictingFamInst
   = addFamInstLoc famInst $
     addErr (hang (ptext (sLit "Conflicting family instance declarations:"))
 	       2 (pprFamInsts [famInst, conflictingFamInst]))
 
+addFamInstLoc :: FamInst -> TcRn a -> TcRn a
 addFamInstLoc famInst thing_inside
   = setSrcSpan (mkSrcSpan loc loc) thing_inside
   where