Make records work properly with type families

[ghc-hetmet.git] / compiler / hsSyn / HsExpr.lhs

diff --git a/compiler/hsSyn/HsExpr.lhs b/compiler/hsSyn/HsExpr.lhs
index 7759885..e56eeac 100644 (file)
--- a/compiler/hsSyn/HsExpr.lhs
+++ b/compiler/hsSyn/HsExpr.lhs
@@ -22,6 +22,7 @@ import HsBinds
 import Var
 import Name
 import BasicTypes
+import DataCon
 import SrcLoc
 import Outputable      
 import FastString
@@ -158,9 +159,11 @@ data HsExpr id
        -- Record update
   | RecordUpd  (LHsExpr id)
                (HsRecordBinds id)
-               PostTcType              -- Type of *input* record
-               PostTcType              -- Type of *result* record (may differ from
-                                       --      type of input record)
+               [DataCon]               -- Filled in by the type checker to the *non-empty*
+                                       -- list of DataCons that have all the upd'd fields
+               [PostTcType]            -- Argument types of *input* record type
+               [PostTcType]            --              and  *output* record type
+       -- For a type family, the arg types are of the *instance* tycon, not the family tycon
 
   | ExprWithTySig                      -- e :: type
                (LHsExpr id)
@@ -380,7 +383,7 @@ ppr_expr (ExplicitTuple exprs boxity)
 ppr_expr (RecordCon con_id con_expr rbinds)
   = pp_rbinds (ppr con_id) rbinds
 
-ppr_expr (RecordUpd aexp rbinds _ _)
+ppr_expr (RecordUpd aexp rbinds _ _ _)
   = pp_rbinds (pprParendExpr aexp) rbinds
 
 ppr_expr (ExprWithTySig expr sig)