Fix a recomp bug: make classes/datatypes depend directly on DFuns (#4469)

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

diff --git a/compiler/typecheck/TcRnMonad.lhs b/compiler/typecheck/TcRnMonad.lhs
index ba694b6..92fa190 100644 (file)
--- a/compiler/typecheck/TcRnMonad.lhs
+++ b/compiler/typecheck/TcRnMonad.lhs
@@ -71,8 +71,7 @@ initTc hsc_env hsc_src keep_rn_syntax mod do_this
  = do { errs_var     <- newIORef (emptyBag, emptyBag) ;
         meta_var     <- newIORef initTyVarUnique ;
        tvs_var      <- newIORef emptyVarSet ;
-       dfuns_var    <- newIORef emptyNameSet ;
-       keep_var     <- newIORef emptyNameSet ;
+        keep_var     <- newIORef emptyNameSet ;
         used_rdr_var <- newIORef Set.empty ;
        th_var       <- newIORef False ;
        lie_var      <- newIORef emptyBag ;
@@ -89,16 +88,15 @@ initTc hsc_env hsc_src keep_rn_syntax mod do_this
             gbl_env = TcGblEnv {
                tcg_mod       = mod,
                tcg_src       = hsc_src,
-               tcg_rdr_env   = hsc_global_rdr_env hsc_env,
+               tcg_rdr_env   = emptyGlobalRdrEnv,
                tcg_fix_env   = emptyNameEnv,
                tcg_field_env = RecFields emptyNameEnv emptyNameSet,
                tcg_default   = Nothing,
-               tcg_type_env  = hsc_global_type_env hsc_env,
+               tcg_type_env  = emptyNameEnv,
                tcg_type_env_var = type_env_var,
                tcg_inst_env  = emptyInstEnv,
                tcg_fam_inst_env  = emptyFamInstEnv,
-               tcg_inst_uses = dfuns_var,
-               tcg_th_used   = th_var,
+                tcg_th_used   = th_var,
                tcg_exports  = [],
                tcg_imports  = emptyImportAvails,
                 tcg_used_rdrnames = used_rdr_var,
@@ -168,9 +166,8 @@ initTcPrintErrors   -- Used from the interactive loop only
        -> Module 
        -> TcM r
        -> IO (Messages, Maybe r)
-initTcPrintErrors env mod todo = do
-  (msgs, res) <- initTc env HsSrcFile False mod todo
-  return (msgs, res)
+
+initTcPrintErrors env mod todo = initTc env HsSrcFile False mod todo
 \end{code}
 
 %************************************************************************
@@ -253,7 +250,7 @@ doptM flag = do { dflags <- getDOpts; return (dopt flag dflags) }
 
 setOptM :: ExtensionFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
 setOptM flag = updEnv (\ env@(Env { env_top = top }) ->
-                        env { env_top = top { hsc_dflags = xopt_set_flattened (hsc_dflags top) flag}} )
+                        env { env_top = top { hsc_dflags = xopt_set (hsc_dflags top) flag}} )
 
 unsetOptM :: DynFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
 unsetOptM flag = updEnv (\ env@(Env { env_top = top }) ->
@@ -330,11 +327,11 @@ newMetaUnique
 newUnique :: TcRnIf gbl lcl Unique
 newUnique
  = do { env <- getEnv ;
-       let { u_var = env_us env } ;
-       us <- readMutVar u_var ;
-        case splitUniqSupply us of { (us1,_) -> do {
-       writeMutVar u_var us1 ;
-       return $! uniqFromSupply us }}}
+        let { u_var = env_us env } ;
+        us <- readMutVar u_var ;
+        case takeUniqFromSupply us of { (uniq, us') -> do {
+        writeMutVar u_var us' ;
+        return $! uniq }}}
    -- NOTE 1: we strictly split the supply, to avoid the possibility of leaving
    -- a chain of unevaluated supplies behind.
    -- NOTE 2: we use the uniq in the supply from the MutVar directly, and
@@ -345,11 +342,11 @@ newUnique
 newUniqueSupply :: TcRnIf gbl lcl UniqSupply
 newUniqueSupply
  = do { env <- getEnv ;
-       let { u_var = env_us env } ;
-       us <- readMutVar u_var ;
+        let { u_var = env_us env } ;
+        us <- readMutVar u_var ;
         case splitUniqSupply us of { (us1,us2) -> do {
-       writeMutVar u_var us1 ;
-       return us2 }}}
+        writeMutVar u_var us1 ;
+        return us2 }}}
 
 newLocalName :: Name -> TcRnIf gbl lcl Name
 newLocalName name      -- Make a clone