[issue2335] Backport set literals

[Brett Cannon]

New submission from Brett Cannon <brett at python.org>:

Set literals need to be backported.

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components: Interpreter Core
keywords: 26backport
messages: 63692
nosy: brett.cannon
priority: immediate
severity: normal
status: open
title: Backport set literals
type: behavior
versions: Python 2.6

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue2335>
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