[issue29476] Simplify set_add_entry()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Sets often are used in following pattern:

    def recurse(obj):
        if subobj not in proceeding:
            proceeding.add(obj)
            for subobj in links(obj):
                recurse(subobj)
            proceeding.discard(obj)

In this case items are added and removed in LIFO order. How this change affects this case?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29476>
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