import gc, traceback

def gen(lst):
    try:
        try:
            yield 1
        finally:
            print "finally 1"
            lst.append(1)
            yield 2
    finally:
        print "finally 2"
        lst.append(2)

# This works
a = []
assert list(gen(a)) == [1, 2]
assert a == [1, 2]

# This does not
b = []
x = gen(b)
assert x.next() == 1
assert b == []
try:
    x.close()
except RuntimeError:
    print "RuntimeError on close"
# Python 2.5c1 says [1] here
if b != [1, 2]:
    print 'b = %r, expecting [1, 2]' % (b,)
del x
gc.collect()
assert b == [1, 2]

# This doesn't get there at all
c = []
x = gen(c)
assert x.next() == 1
assert c == []
del x
gc.collect()
# RuntimeError ignored, but only the first finally executes
if c != [1, 2]:
    print 'c = %r, expecting [1, 2]' % (c,)