[project @ 2003-05-07 08:30:08 by simonpj]

Print type of data constructors correctly in GHCi

diff --git a/ghc/compiler/main/MkIface.lhs b/ghc/compiler/main/MkIface.lhs
index e165020..f06c7c3 100644 (file)
--- a/ghc/compiler/main/MkIface.lhs
+++ b/ghc/compiler/main/MkIface.lhs
@@ -39,8 +39,7 @@ import HscTypes               ( VersionInfo(..), ModIface(..),
 
 import CmdLineOpts
 import Id              ( idType, idInfo, isImplicitId, idCafInfo )
-import DataCon         ( dataConName, dataConSig, dataConFieldLabels,
-                         dataConStrictMarks, dataConWrapId )
+import DataCon         ( dataConName, dataConSig, dataConFieldLabels, dataConStrictMarks )
 import IdInfo          -- Lots
 import CoreSyn         ( CoreRule(..), IdCoreRule )
 import CoreFVs         ( ruleLhsFreeNames )
@@ -56,7 +55,8 @@ import TyCon          ( DataConDetails(..), tyConTyVars, tyConDataCons, tyConTheta,
                          getSynTyConDefn, tyConGenInfo, tyConDataConDetails, tyConArity )
 import Class           ( classExtraBigSig, classTyCon )
 import FieldLabel      ( fieldLabelType )
-import TcType          ( tcSplitForAllTys, tcFunResultTy, tidyTopType, deNoteType, tyClsNamesOfDFunHead )
+import TcType          ( tcSplitForAllTys, tcFunResultTy, tidyTopType, deNoteType, tyClsNamesOfDFunHead,
+                         mkSigmaTy, mkFunTys, mkTyConApp, mkTyVarTys )
 import SrcLoc          ( noSrcLoc )
 import Module          ( Module, ModuleName, moduleNameFS, moduleName, isHomeModule,
                          ModLocation(..), mkSysModuleNameFS, 
@@ -336,7 +336,7 @@ ifaceTyThing (AnId id) = iface_sig
     iface_sig = IfaceSig { tcdName   = getName id, 
                           tcdType   = toHsType id_type,
                           tcdIdInfo = hs_idinfo,
-                          tcdLoc    =  noSrcLoc }
+                          tcdLoc    = noSrcLoc }
 
     id_type = idType id
     id_info = idInfo id
@@ -383,9 +383,21 @@ ifaceTyThing (AnId id) = iface_sig
                  | otherwise   = Just (HsUnfold inline_prag (toUfExpr rhs))
 
 
-ifaceTyThing (ADataCon dc) = ifaceTyThing (AnId (dataConWrapId dc))
+ifaceTyThing (ADataCon dc)
        -- This case only happens in the call to ifaceThing in InteractiveUI
        -- Otherwise DataCons are filtered out in ifaceThing_acc
+ = IfaceSig { tcdName   = getName dc, 
+             tcdType   = toHsType full_ty,
+             tcdIdInfo = [],
+             tcdLoc    = noSrcLoc }
+ where
+    (tvs, stupid_theta, ex_tvs, ex_theta, arg_tys, tycon) = dataConSig dc
+
+       -- The "stupid context" isn't part of the wrapper-Id type
+       -- (for better or worse -- see note in DataCon.lhs), so we
+       -- have to make it up here
+    full_ty = mkSigmaTy (tvs ++ ex_tvs) (stupid_theta ++ ex_theta) 
+                       (mkFunTys arg_tys (mkTyConApp tycon (mkTyVarTys tvs)))
 \end{code}
 
 \begin{code}