fix #1015

tests/metatype/tusertypeclasses2.nim

@@ -0,0 +1,24 @@
+type
+  hasFieldX = generic z
+    z.x is int
+
+  obj_x = object
+    x: int
+
+  ref_obj_x = ref object
+    x: int
+  
+  ref_to_obj_x = ref obj_x
+
+  p_o_x = ptr obj_x
+  v_o_x = var obj_x
+
+template check(x) =
+  static: assert(x)
+
+check obj_x is hasFieldX
+check ref_obj_x is hasFieldX
+check ref_to_obj_x is hasFieldX
+check p_o_x is hasFieldX
+check v_o_x is hasFieldX
+