Unexpected failure with set product

[qtothec]

The code below is expected to work, but does not. The first m.test = Block statement goes through properly, but an error appears during the m.test2 = Block line.

Related issue: #326
This might be another manifestation of #134

from pyomo.environ import *
m = ConcreteModel()
m.s = RangeSet(1)
m.s2 = RangeSet(1)
m.set_mult = m.s * m.s2
m.s3 = RangeSet(1)

def _test(b, x, y, z):
    print(x, y, z)
m.test = Block(m.set_mult, m.s3, rule=_test)
m.test2 = Block(m.set_mult, m.s3, rule=_test)

Output:

(1, 1, 1)
ERROR: Constructing component 'test2' from data=None failed: TypeError:
    _test() takes exactly 4 arguments (5 given)
Traceback (most recent call last):
  File "set_fail.py", line 11, in <module>
    m.test2 = Block(m.set_mult, m.s3, rule=_test)
  File "/home/qichen/git/pyomo/pyomo/core/base/block.py", line 540, in __setattr__
    self.add_component(name, val)
  File "/home/qichen/git/pyomo/pyomo/core/base/block.py", line 980, in add_component
    val.construct(data)
  File "/home/qichen/git/pyomo/pyomo/core/base/block.py", line 1796, in construct
    self, self._rule, _block, idx, self._options)
  File "/home/qichen/git/pyomo/pyomo/core/base/misc.py", line 80, in apply_indexed_rule
    return rule(model, *index)
TypeError: _test() takes exactly 4 arguments (5 given)

This is using the current master branch commit 7d4eee7.