[issue2350] Warn against importing 'exceptions'

[Douglas Mayle]

Douglas Mayle <douglas at openplans.org> added the comment:

I ran python through a debugger and found that the exceptions module is
imported automatically at load time.  Because of this, when "import
exceptions" is parsed, the module is already loaded, and PyImport_Import
is not called.  In order to correct this, we'll have to either catch
this at the AST, or just handle it in 2to3...

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nosy: +douglas

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