Handle Python 3.3 > dotted class names

test/simple_source/def/05_class.py

@@ -0,0 +1,13 @@
+# Tests:
+#   importstmt ::= LOAD_CONST LOAD_CONST import_as
+#   import_as ::= IMPORT_NAME designator
+
+#   Since Python 3.3:
+#     classdef ::= buildclass designator
+#     designator ::= STORE_NAME
+#     buildclass ::= LOAD_BUILD_CLASS mkfunc LOAD_CONST expr CALL_FUNCTION_3
+#     mkfunc ::= LOAD_CONST LOAD_CONST MAKE_FUNCTION_0
+
+import io
+class BZ2File(io.BufferedIOBase):
+    pass