[issue12575] add a AST validator

[Benjamin Peterson]

New submission from Benjamin Peterson <benjamin at python.org>:

The goal of this patch to keep people doing silly things like producing a Try with no finalbody or excepthandlers and segfaulting the compiler in unpleasant ways.

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components: Interpreter Core
files: ast_validator.patch
keywords: patch
messages: 140505
nosy: benjamin.peterson, ncoghlan
priority: normal
severity: normal
status: open
title: add a AST validator
versions: Python 3.3
Added file: http://bugs.python.org/file22678/ast_validator.patch

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<http://bugs.python.org/issue12575>
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