Issue1407

The following code leads to a ClassCastException:

----------------------------
def add(target):
    while True:
        target.send( (yield) + 1 )

def sink():
    while True:
        print( (yield) )

p = add(sink()) ; p.next()

p.send(5)   #  <== fails!
p.close()
----------------------------

When running it, I get:

Traceback (most recent call last):
  File "pype/jytest.py", line 15, in <module>
    p.send(5)
  File "pype/jytest.py", line 4, in add
    target.send( (yield) + 1 )
java.lang.ClassCastException: org.python.core.PyGenerator$send_exposer
cannot be cast to org.python.core.ThreadState
        at org.python.pycode._pyx0.add$1(pype/jytest.py:3)
        at org.python.pycode._pyx0.call_function(pype/jytest.py)
        at org.python.core.PyTableCode.call(PyTableCode.java:165)
        at org.python.core.PyGenerator.__iternext__(PyGenerator.java:129)
        at org.python.core.PyGenerator.__iternext__(PyGenerator.java:112)
        at org.python.core.PyIterator.next(PyIterator.java:42)
        at org.python.core.PyGenerator.next(PyGenerator.java:68)
        at org.python.core.PyGenerator.send(PyGenerator.java:39)
        at org.python.core.PyGenerator$send_exposer.__call__(Unknown Source)
        at org.python.core.PyObject.__call__(PyObject.java:401)
        at org.python.pycode._pyx0.f$0(pype/jytest.py:16)
        at org.python.pycode._pyx0.call_function(pype/jytest.py)
        at org.python.core.PyTableCode.call(PyTableCode.java:165)
        at org.python.core.PyCode.call(PyCode.java:18)
        at org.python.core.Py.runCode(Py.java:1198)
        at
org.python.util.PythonInterpreter.execfile(PythonInterpreter.java:166)
        at org.python.util.jython.run(jython.java:229)
        at org.python.util.jython.main(jython.java:117)

java.lang.ClassCastException: java.lang.ClassCastException:
org.python.core.PyGenerator$send_exposer cannot be cast to
org.python.core.ThreadState

It looks like the stack gets scrambled when yield is in the argument
list, shouldn't there be cases for this in the standard test suite?

It could (for some strange reason) be specific to send, I'll investigate
and fix this ASAP.

Fixed in revision 6555:
http://jython.svn.sourceforge.net/viewvc/jython?view=rev&revision=6555

This error was much worse than expected. The stack was not restored
properly after yield, any invocation where yield was in the argument
list was faulty. I am amazed that there were no test cases in the
standard test suite for catching this. Here is a simpler failing example:

  def one():
    two((yield))
  def two(x):
    print x
  o = one(); o.next()
  o.send(5)

This is all fixed now though.