fixes #554, fixes #179

compiler/semstmts.nim

@@ -775,9 +775,12 @@ proc typeSectionFinalPass(c: PContext, n: PNode) =
     if aa.kind in {nkRefTy, nkPtrTy} and aa.len == 1 and
        aa.sons[0].kind == nkObjectTy:
       # give anonymous object a dummy symbol:
-      assert s.typ.sons[0].sym == nil
-      s.typ.sons[0].sym = newSym(skType, getIdent(s.name.s & ":ObjectType"), 
-                                 getCurrOwner(), s.info)
+      var st = s.typ
+      if st.kind == tyGenericBody: st = st.lastSon
+      InternalAssert st.kind in {tyPtr, tyRef}
+      InternalAssert st.sons[0].sym == nil
+      st.sons[0].sym = newSym(skType, getIdent(s.name.s & ":ObjectType"),
+                              getCurrOwner(), s.info)
 
 proc SemTypeSection(c: PContext, n: PNode): PNode =
   typeSectionLeftSidePass(c, n)

compiler/semtypes.nim

@@ -558,7 +558,7 @@ proc semObjectNode(c: PContext, n: PNode, prev: PType): PType =
   checkSonsLen(n, 3)
   if n.sons[1].kind != nkEmpty: 
     base = skipTypes(semTypeNode(c, n.sons[1].sons[0], nil), skipPtrs)
-    var concreteBase = skipGenericInvokation(base)
+    var concreteBase = skipGenericInvokation(base).skipTypes(skipPtrs)
     if concreteBase.kind == tyObject and tfFinal notin concreteBase.flags: 
       addInheritedFields(c, check, pos, concreteBase)
     else:

tests/compile/tinheritref.nim

@@ -0,0 +1,27 @@
+discard """
+  output: "23"
+"""
+
+# bug #554, #179
+
+type T[E] =
+  ref object
+    elem: E
+
+var ob: T[int]
+
+ob = T[int](elem: 23)
+echo ob.elem
+
+type
+  TTreeIteratorA* = ref object {.inheritable.}
+
+  TKeysIteratorA* = ref object of TTreeIteratorA  #compiles
+
+  TTreeIterator* [T,D] = ref object {.inheritable.}
+
+  TKeysIterator* [T,D] = ref object of TTreeIterator[T,D]  #this not
+  
+var
+  it: TKeysIterator[int, string] = nil
+