fixes #11747

tests/metatype/ttypedesc3.nim

@@ -5,6 +5,7 @@ proc Child
 method Base
 yield Base
 yield Child
+12
 '''
 """
 
@@ -27,3 +28,16 @@ when false:
 
 for s in Base.it: echo s
 for s in Child.it: echo s #<- bug #2662
+
+
+# bug #11747
+
+type
+  MyType = object
+    a: int32
+    b: int32
+    c: int32
+
+  MyRefType = ref MyType
+
+echo sizeof(MyRefType[])