Pony ORM fails in Python 3.5

andreymal@home:~$ python3
Python 3.5.0 (default, Sep 20 2015, 11:28:25)
[GCC 5.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pony.orm import *
>>>
>>> db = Database('sqlite', ':memory:')
>>>
>>> class Foo(db.Entity):
...     name = Required(str)
...     bar = Optional('Bar')
...
>>> class Bar(db.Entity):
...     foos = Set(Foo)
...
>>> db.generate_mapping(create_tables=True)
>>> Bar().foos.select()[:]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 2, in select
  File "/usr/lib/python3.5/site-packages/pony/utils.py", line 105, in cut_traceback
    raise exc  # Set "pony.options.CUT_TRACEBACK = False" to see full traceback
  File "/usr/lib/python3.5/site-packages/pony/utils.py", line 90, in cut_traceback
    try: return func(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/pony/orm/core.py", line 2533, in select
    query = query.filter(s % reverse.name, {'obj' : obj, 'JOIN': JOIN})
  File "<string>", line 2, in filter
  File "/usr/lib/python3.5/site-packages/pony/utils.py", line 105, in cut_traceback
    raise exc  # Set "pony.options.CUT_TRACEBACK = False" to see full traceback
  File "/usr/lib/python3.5/site-packages/pony/utils.py", line 90, in cut_traceback
    try: return func(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/pony/orm/core.py", line 4672, in filter
    return query._process_lambda(func, globals, locals, order_by=False)
  File "/usr/lib/python3.5/site-packages/pony/orm/core.py", line 4601, in _process_lambda
    func_ast = string2ast(func)
  File "/usr/lib/python3.5/site-packages/pony/orm/core.py", line 4192, in string2ast
    module_node = parse('(%s)' % s)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 60, in parse
    return Transformer().parsesuite(buf)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 138, in parsesuite
    return self.transform(parser.suite(text))
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 134, in transform
    return self.compile_node(tree)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 167, in compile_node
    return self.file_input(node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 198, in file_input
    self.com_append_stmt(stmts, node)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1117, in com_append_stmt
    result = self.lookup_node(node)(node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 327, in stmt
    return self.com_stmt(nodelist[0])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1110, in com_stmt
    result = self.lookup_node(node)(node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 337, in simple_stmt
    self.com_append_stmt(stmts, nodelist[i])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1117, in com_append_stmt
    result = self.lookup_node(node)(node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 327, in stmt
    return self.com_stmt(nodelist[0])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1110, in com_stmt
    result = self.lookup_node(node)(node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 375, in expr_stmt
    exprNode = self.lookup_node(en)(en[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 591, in testlist_star_expr
    return self.com_binary(Tuple, nodelist)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1102, in com_binary
    return self.lookup_node(n)(n[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 614, in test
    then = self.com_node(nodelist[0])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 824, in com_node
    return self._dispatch[node[0]](node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 628, in or_test
    return self.com_binary(Or, nodelist)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1102, in com_binary
    return self.lookup_node(n)(n[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 634, in and_test
    return self.com_binary(And, nodelist)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1102, in com_binary
    return self.lookup_node(n)(n[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 638, in not_test
    result = self.com_node(nodelist[-1])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 824, in com_node
    return self._dispatch[node[0]](node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 645, in comparison
    node = self.com_node(nodelist[0])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 824, in com_node
    return self._dispatch[node[0]](node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 678, in expr
    return self.com_binary(Bitor, nodelist)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1102, in com_binary
    return self.lookup_node(n)(n[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 682, in xor_expr
    return self.com_binary(Bitxor, nodelist)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1102, in com_binary
    return self.lookup_node(n)(n[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 686, in and_expr
    return self.com_binary(Bitand, nodelist)
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 1102, in com_binary
    return self.lookup_node(n)(n[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 690, in shift_expr
    node = self.com_node(nodelist[0])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 824, in com_node
    return self._dispatch[node[0]](node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 702, in arith_expr
    node = self.com_node(nodelist[0])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 824, in com_node
    return self._dispatch[node[0]](node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 714, in term
    node = self.com_node(nodelist[0])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 824, in com_node
    return self._dispatch[node[0]](node[1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 734, in factor
    node = self.lookup_node(nodelist[-1])(nodelist[-1][1:])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 746, in power
    node = self.com_node(nodelist[0])
  File "/usr/lib/python3.5/site-packages/pony/thirdparty/compiler/transformer.py", line 824, in com_node
    return self._dispatch[node[0]](node[1:])
KeyError: 322