X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fmain%2FHscMain.lhs;fp=compiler%2Fmain%2FHscMain.lhs;h=09f513014ff36f2e408843224ca5c0c143536a20;hp=09db7a8492ea1f66397b6b240570bbd23560ecb2;hb=3deca8f44135bd1a146902f498189af00dd4d7b4;hpb=8c49df053ecee921f7c7385fac1f46f2c5ee69dc

diff --git a/compiler/main/HscMain.lhs b/compiler/main/HscMain.lhs
index 09db7a8..09f5130 100644
--- a/compiler/main/HscMain.lhs
+++ b/compiler/main/HscMain.lhs
@@ -97,7 +97,6 @@ import SrcLoc
 import TcRnDriver
 import TcIface		( typecheckIface )
 import TcRnMonad
-import RnNames          ( rnImports )
 import IfaceEnv		( initNameCache )
 import LoadIface	( ifaceStats, initExternalPackageState )
 import PrelInfo		( wiredInThings, basicKnownKeyNames )
@@ -306,11 +305,12 @@ hscRnImportDecls
         -> [LImportDecl RdrName]
         -> IO GlobalRdrEnv
 
-hscRnImportDecls hsc_env this_mod import_decls = runHsc hsc_env $ do
-  (_, r, _, _) <- 
-       ioMsgMaybe $ initTc hsc_env HsSrcFile False this_mod $
-          rnImports import_decls
-  return r
+-- It is important that we use tcRnImports instead of calling rnImports directly
+-- because tcRnImports will force-load any orphan modules necessary, making extra
+-- instances/family instances visible (GHC #4832)
+hscRnImportDecls hsc_env this_mod import_decls
+  = runHsc hsc_env $ ioMsgMaybe $ initTc hsc_env HsSrcFile False this_mod $
+          fmap tcg_rdr_env $ tcRnImports hsc_env this_mod import_decls
 
 -- -----------------------------------------------------------------------------
 -- | parse a file, returning the abstract syntax