[MERGE] Conditionalize format warnings

[Aaron Bentley]

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Matthew D. Fuller wrote:
> On Thu, May 24, 2007 at 08:44:01PM -0400 I heard the voice of
> Aaron Bentley, and lo! it spake thus:
>> Still not really happy about using the branch config only some of
>> the time.
> 
> I'm not sure I understand what you mean.  I'm using the branch config
> all the time that I can find it.  It only falls back to only checking
> global when the function isn't being told where it's looking, and I
> don't know what else I can do in that case.

You can make base a required parameter of _check_supported, and issue a
deprecation warning if it's not provided.

Aaron
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