Class GC_Detector

Lib/test/test_gc.py:52–64

        self.loop = self

class GC_Detector(object):
    # Create an instance I.  Then gc hasn't happened again so long as
    # I.gc_happened is false.

    def __init__(self):
        self.gc_happened = False

        def it_happened(ignored):
            self.gc_happened = True

        # Create a piece of cyclic trash that triggers it_happened when
        # gc collects it.
        self.wr = weakref.ref(C1055820(666), it_happened)

@with_tp_del
class Uncollectable(object):