Issue1406

I get reproducible crashes when parsing a simple PEP 342 coroutine in
Jython, e.g.

  def dechunk(target):
      while True:
          for item in (yield):
              target.send(item)

The error is:

java.lang.VerifyError: (class: org/python/pycode/_pyx0, method:
dechunk$1 signature:
(Lorg/python/core/PyFrame;Lorg/python/core/ThreadState;)Lorg/python/core/PyObject;)
Register 3 contains wrong type
        at java.lang.Class.getDeclaredConstructors0(Native Method)
        at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
        at java.lang.Class.getConstructor0(Class.java:2699)
        at java.lang.Class.getConstructor(Class.java:1657)
        at org.python.core.BytecodeLoader.makeCode(BytecodeLoader.java:68)
        at
org.python.compiler.LegacyCompiler$LazyLegacyBundle.loadCode(LegacyCompiler.java:43)
        at org.python.core.CompilerFacade.compile(CompilerFacade.java:34)
        at org.python.core.Py.compile_flags(Py.java:1631)
        at org.python.core.Py.compile_flags(Py.java:1636)
        at org.python.core.Py.compile_flags(Py.java:1646)
        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)


This is with Jython 2.5.0 final (and latest SVN) on Linux using SUN's
Java 6:

java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) Server VM (build 11.0-b15, mixed mode)

Same with Sun JRE 1.5.0.16.

reproduced. ouch.

I know what this is, I've fixed similar problems in other places. I'll
get on it right away.

Here is a smaller sample that causes the same problem:

  def err():
      for item in (yield):
          pass

Fixed in revision 6550.