rev 1686 breaking mapper

Here is a small test program that fails in rev 1686, file sqlalchemy/lib/sqlalchemy/orm/mapper.py line 196, in compile assert len(_compile_triggers) == 0
from sqlalchemy import *

metadata = MetaData(name='Test Metadata')

class Indice(object):
    pass

class Company(object):
    pass

class CompanyDailyTrading(object):
    pass

class IndiceDailyTrading(object):
    pass

indice_table = Table('indice', metadata,
                           Column('code', String(7), primary_key=True),
                           )

indice_trading_table = Table('indice_trading_history', metadata,
                             Column('code', String(7), ForeignKey('indice.code'), primary_key=True),
                             Column('date', DateTime, primary_key=True))

company_table = Table('company', metadata,
                            Column('code', String(7), primary_key=True))

company_trading_table = Table('company_trading_history', metadata,
                              Column('code', String(7), ForeignKey('company.code'), primary_key=True),
                              Column('date', DateTime, primary_key=True))


CompanyDailyTrading.mapper = mapper( CompanyDailyTrading, company_trading_table, is_primary=True)
IndiceDailyTrading.mapper = mapper( IndiceDailyTrading, indice_trading_table, is_primary=True)

Indice.mapper = mapper(Indice, indice_table, 
                       properties = {
                           'daily_trading' : relation(IndiceDailyTrading.mapper, private=True, lazy=True, 
                                                      primaryjoin=indice_table.c.code==IndiceDailyTrading.c.code),
                           }, 
                       is_primary=True)

Company.mapper = mapper(Company, company_table,  is_primary=True, 
                                     properties={
                                         'daily_trading' : relation(CompanyDailyTrading.mapper, 
                                                                   lazy=True, 
                                                                   primaryjoin=company_table.c.code==CompanyDailyTrading.c.code)
                                         })
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