[project @ 1997-11-17 13:52:56 by simonm]

Pull in the IO type for typechecking main

diff --git a/ghc/compiler/rename/Rename.lhs b/ghc/compiler/rename/Rename.lhs
index 789a06b..bd51090 100644 (file)
--- a/ghc/compiler/rename/Rename.lhs
+++ b/ghc/compiler/rename/Rename.lhs
@@ -44,6 +44,7 @@ import Name           ( Name, Provenance, ExportFlag(..), isLocallyDefined,
 import TysWiredIn      ( unitTyCon, intTyCon, doubleTyCon )
 import TyCon           ( TyCon )
 import PrelMods                ( mAIN, gHC_MAIN )
+import PrelInfo                ( ioTyCon_NAME )
 import ErrUtils                ( SYN_IE(Error), SYN_IE(Warning), pprBagOfErrors, 
                          doIfSet, dumpIfSet, ghcExit
                        )
@@ -171,13 +172,18 @@ mentioned explicitly, but which might be needed by the type checker.
 
 \begin{code}
 addImplicits mod_name
-  = addImplicitOccsRn default_tys
+  = addImplicitOccsRn (implicit_main ++ default_tys)
   where
        -- Add occurrences for Int, Double, and (), because they
        -- are the types to which ambigious type variables may be defaulted by
        -- the type checker; so they won't every appear explicitly.
        -- [The () one is a GHC extension for defaulting CCall results.]
     default_tys = [getName intTyCon, getName doubleTyCon, getName unitTyCon ]
+
+       -- Add occurrences for IO or PrimIO
+    implicit_main |  mod_name == mAIN
+                 || mod_name == gHC_MAIN = [ioTyCon_NAME]
+                 |  otherwise            = []
 \end{code}