Fix SF bug #489581: __slots__ leak.
It was easier than I thought, assuming that no other things contribute
to the instance size besides slots -- a pretty good bet. With a test
suite, no less!
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index b73025b..481ca0f 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -1000,6 +1000,40 @@
vereq(x.b, 2)
vereq(x.c, 3)
+ # Test leaks
+ class Counted(object):
+ counter = 0 # counts the number of instances alive
+ def __init__(self):
+ Counted.counter += 1
+ def __del__(self):
+ Counted.counter -= 1
+ class C(object):
+ __slots__ = ['a', 'b', 'c']
+ x = C()
+ x.a = Counted()
+ x.b = Counted()
+ x.c = Counted()
+ vereq(Counted.counter, 3)
+ del x
+ vereq(Counted.counter, 0)
+ class D(C):
+ pass
+ x = D()
+ x.a = Counted()
+ x.z = Counted()
+ vereq(Counted.counter, 2)
+ del x
+ vereq(Counted.counter, 0)
+ class E(D):
+ __slots__ = ['e']
+ x = E()
+ x.a = Counted()
+ x.z = Counted()
+ x.e = Counted()
+ vereq(Counted.counter, 3)
+ del x
+ vereq(Counted.counter, 0)
+
def dynamics():
if verbose: print "Testing class attribute propagation..."
class D(object):