synonymproperty not defined

[Former user]

When I do the following in rev2001, I get

NameError: global name 'SynonymProperty' is not defined

This worked in 0.2.8.

db = create_engine('postgres://...')
metadata = BoundMetaData(db)

user = Table('user', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String(40)),
    Column('password', String(10)))

class User(object):
    pass

mapper(User, user, properties={
    'user_name': user.c.name,
    'name' : synonym('user_name')})

[Mike Bayer]

i restored synonymproperty in the latest trunk.