[issue2331] Backport parameter annotations

[Brett Cannon]

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

Parameter annotations (e.g., ``def fxn(a:int) -> str: pass`` need to be
backported.

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components: Interpreter Core
keywords: 26backport
messages: 63688
nosy: brett.cannon
priority: immediate
severity: normal
status: open
title: Backport parameter annotations
type: behavior
versions: Python 2.6

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