fixes #10033 [backport]

compiler/ccgtypes.nim

@@ -970,9 +970,9 @@ proc genTypeInfoAux(m: BModule, typ, origType: PType, name: Rope;
 
 proc discriminatorTableName(m: BModule, objtype: PType, d: PSym): Rope =
   # bugfix: we need to search the type that contains the discriminator:
-  var objtype = objtype
+  var objtype = objtype.skipTypes(abstractPtrs)
   while lookupInRecord(objtype.n, d.name) == nil:
-    objtype = objtype.sons[0]
+    objtype = objtype.sons[0].skipTypes(abstractPtrs)
   if objtype.sym == nil:
     internalError(m.config, d.info, "anonymous obj with discriminator")
   result = "NimDT_$1_$2" % [rope($hashType(objtype)), rope(d.name.s.mangle)]

tests/objvariant/tyaoption.nim

@@ -1,7 +1,8 @@
 discard """
   output: '''some(str), some(5), none
 some(5!)
-some(10)'''
+some(10)
+34'''
 """
 
 import strutils
@@ -45,3 +46,25 @@ let a3 = intOrString(some(5))
 #echo a1
 echo a2
 echo a3
+
+
+# bug #10033
+
+type
+  Token = enum
+    Int,
+    Float
+
+  Base = ref object of RootObj
+    case token: Token
+    of Int:
+      bInt: int
+    of Float:
+      bFloat: float
+
+  Child = ref object of Base
+
+let c = new Child
+c.token = Int
+c.bInt = 34
+echo c.bInt