[project @ 2006-01-18 11:13:06 by simonpj]

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

diff --git a/ghc/compiler/typecheck/TcEnv.lhs b/ghc/compiler/typecheck/TcEnv.lhs
index 06b79f7..31d81a4 100644 (file)
--- a/ghc/compiler/typecheck/TcEnv.lhs
+++ b/ghc/compiler/typecheck/TcEnv.lhs
@@ -46,7 +46,6 @@ import HsSyn          ( LRuleDecl, LHsBinds, LSig,
                          LHsTyVarBndr, HsTyVarBndr(..), pprLHsBinds )
 import TcIface         ( tcImportDecl )
 import IfaceEnv                ( newGlobalBinder )
-import TcRnTypes       ( pprTcTyThingCategory )
 import TcRnMonad
 import TcMType         ( zonkTcType, zonkTcTyVarsAndFV )
 import TcType          ( Type, TcKind, TcTyVar, TcTyVarSet, TcType,
@@ -64,7 +63,8 @@ import InstEnv                ( Instance, DFunId, instanceDFunId, instanceHead )
 import DataCon         ( DataCon )
 import TyCon           ( TyCon )
 import Class           ( Class )
-import Name            ( Name, NamedThing(..), getSrcLoc, nameIsLocalOrFrom )
+import Name            ( Name, NamedThing(..), getSrcLoc, nameModule, isExternalName )
+import PrelNames       ( thFAKE )
 import NameEnv
 import OccName         ( mkDFunOcc, occNameString )
 import HscTypes                ( extendTypeEnvList, lookupType,
@@ -93,21 +93,32 @@ tcLookupLocatedGlobal name
   = addLocM tcLookupGlobal name
 
 tcLookupGlobal :: Name -> TcM TyThing
+-- The Name is almost always an ExternalName, but not always
+-- In GHCi, we may make command-line bindings (ghci> let x = True)
+-- that bind a GlobalId, but with an InternalName
 tcLookupGlobal name
   = do { env <- getGblEnv
-       ; if nameIsLocalOrFrom (tcg_mod env) name
-
-         then  -- It's defined in this module
-             case lookupNameEnv (tcg_type_env env) name of
-               Just thing -> return thing
-               Nothing    -> notFound  name    -- Panic!
+       
+               -- Try local envt
+       ; case lookupNameEnv (tcg_type_env env) name of {
+               Just thing -> return thing ;
+               Nothing    -> do 
         
-         else do               -- It's imported
+               -- Try global envt
        { (eps,hpt) <- getEpsAndHpt
-       ; case lookupType hpt (eps_PTE eps) name of 
-           Just thing -> return thing 
-           Nothing    -> tcImportDecl name
-    }}
+       ; case lookupType hpt (eps_PTE eps) name of  {
+           Just thing -> return thing ;
+           Nothing    -> do
+
+               -- Should it have been in the local envt?
+       { let mod = nameModule name
+       ; if mod == tcg_mod env || mod == thFAKE then
+               notFound name   -- It should be local, so panic
+                               -- The thFAKE possibility is because it
+                               -- might be in a declaration bracket
+         else
+               tcImportDecl name       -- Go find it in an interface
+       }}}}}
 
 tcLookupGlobalId :: Name -> TcM Id
 -- Never used for Haskell-source DataCons, hence no ADataCon case