fixes #4545

tests/overload/tvart_varargs.nim

@@ -0,0 +1,18 @@
+
+# bug #4545
+type SomeObject = object
+    a : int
+
+type AbstractObject = object
+  objet: ptr SomeObject
+
+proc convert(this: var SomeObject): AbstractObject =
+  AbstractObject(objet: this.addr)
+
+proc varargProc(args: varargs[AbstractObject, convert]): int =
+  for arg in args:
+    result += arg.objet.a
+
+var obj = SomeObject(a: 17)
+
+discard varargProc(obj)