returning a value (other than None) from __init__ is
supposed to raise TypeError. This only works for
old-style classes.

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# I've failed to attach this file so I've added a comment.
This should be modified to report eventual failure and added
to the test library.

class LegalConstructor1(object):

    def __init__(self):
        return

class LegalConstructor2(object):

    def __init__(self):
        return None

class IlegalConstructor(object):

    def __init__(self):
        return "x"

class LegalConstructorOld1:

    def __init__(self):
        return

class LegalConstructorOld2:

    def __init__(self):
        return None

class IlegalConstructorOld:

    def __init__(self):
        return "x"

a = LegalConstructor1()
print a

b = LegalConstructor2()
print b

x = LegalConstructorOld1()
print a

y = LegalConstructorOld2()
print b

# !!! This should raise TypeError
c = IlegalConstructor()
print c

z = IlegalConstructorOld()
print z

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This has been fixed for 2.4.1 where a RuntimeWarning is
raised and in 2.5.0a where a TypeError is raised.