Merge branch 'master' of http://darcs.haskell.org/ghc into ghc-generics

[ghc-hetmet.git] / compiler / typecheck / TcInstDcls.lhs

diff --git a/compiler/typecheck/TcInstDcls.lhs b/compiler/typecheck/TcInstDcls.lhs
index 503812a..3a7ecc7 100644 (file)
--- a/compiler/typecheck/TcInstDcls.lhs
+++ b/compiler/typecheck/TcInstDcls.lhs
@@ -208,7 +208,7 @@ Just <blah>.
 Instead, we simply rely on the fact that casts are cheap:
 
    $df :: forall a. C a => C [a]
-   {-# INLINE df #}  -- NB: INLINE this
+   {-# INLINE df #-}  -- NB: INLINE this
    $df = /\a. \d. MkC [a] ($cop_list a d)
        = $cop_list |> forall a. C a -> (sym (Co:C [a]))
 
@@ -372,7 +372,6 @@ tcInstDecls1 tycl_decls inst_decls deriv_decls
        ; let { (local_info,
                 at_tycons_s)   = unzip local_info_tycons
              ; at_idx_tycons   = concat at_tycons_s ++ idx_tycons
-             ; clas_decls      = filter (isClassDecl . unLoc) tycl_decls
              ; implicit_things = concatMap implicitTyThings at_idx_tycons
             ; aux_binds       = mkRecSelBinds at_idx_tycons
              }
@@ -381,31 +380,32 @@ tcInstDecls1 tycl_decls inst_decls deriv_decls
                 --     tythings to the global environment
        ; tcExtendGlobalEnv (at_idx_tycons ++ implicit_things) $ do {
 
-                -- (3) Instances from generic class declarations
-       ; generic_inst_info <- getGenericInstances clas_decls
 
                 -- Next, construct the instance environment so far, consisting
                 -- of
                 --   (a) local instance decls
-                --   (b) generic instances
-                --   (c) local family instance decls
+                --   (b) local family instance decls
        ; addInsts local_info         $
-         addInsts generic_inst_info  $
          addFamInsts at_idx_tycons   $ do {
 
-                -- (4) Compute instances from "deriving" clauses;
+                -- (3) Compute instances from "deriving" clauses;
                 -- This stuff computes a context for the derived instance
                 -- decl, so it needs to know about all the instances possible
                 -- NB: class instance declarations can contain derivings as
                 --     part of associated data type declarations
-        failIfErrsM            -- If the addInsts stuff gave any errors, don't
-                               -- try the deriving stuff, becuase that may give
-                               -- more errors still
-       ; (deriv_inst_info, deriv_binds, deriv_dus) 
+        failIfErrsM    -- If the addInsts stuff gave any errors, don't
+                       -- try the deriving stuff, because that may give
+                       -- more errors still
+       ; (deriv_inst_info, deriv_binds, deriv_dus, deriv_tys, deriv_ty_insts) 
               <- tcDeriving tycl_decls inst_decls deriv_decls
-       ; gbl_env <- addInsts deriv_inst_info getGblEnv
+
+       -- Extend the global environment also with the generated datatypes for
+       -- the generic representation
+       ; gbl_env <- addFamInsts (map ATyCon deriv_ty_insts) $
+                      tcExtendGlobalEnv (map ATyCon (deriv_tys ++ deriv_ty_insts)) $
+                        addInsts deriv_inst_info getGblEnv
        ; return ( addTcgDUs gbl_env deriv_dus,
-                  generic_inst_info ++ deriv_inst_info ++ local_info,
+                  deriv_inst_info ++ local_info,
                   aux_binds `plusHsValBinds` deriv_binds)
     }}}
 
@@ -1095,10 +1095,15 @@ tcInstanceMethods dfun_id clas tyvars dfun_ev_vars inst_tys
 
     ----------------------
     tc_default :: Id -> DefMeth -> TcM (TcId, LHsBind Id)
+
+    tc_default sel_id (GenDefMeth dm_name)
+      = do { meth_bind <- mkGenericDefMethBind clas inst_tys sel_id dm_name
+           ; tc_body sel_id False {- Not generated code? -} meth_bind }
+{-
     tc_default sel_id GenDefMeth    -- Derivable type classes stuff
       = do { meth_bind <- mkGenericDefMethBind clas inst_tys sel_id
            ; tc_body sel_id False {- Not generated code? -} meth_bind }
-         
+-}
     tc_default sel_id NoDefMeth            -- No default method at all
       = do { warnMissingMethod sel_id
           ; (meth_id, _) <- mkMethIds clas tyvars dfun_ev_vars