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Base classes for features that are backwards-incompatible.

Usage:
features = Features()
features.add(Feature("py3k_feature", "power<
'py3k' any* >", "2.7"))
PATTERN = features.PATTERN
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    A feature has a name, a pattern, and a minimum version of Python 2.x
    required to use the feature (or 3.x if there is no backwards-compatible
    version of 2.x)
   
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        Format the above text with the name and minimum version required.
       
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    A set of features that generates a pattern for the features it
contains.
    This set will act like a mapping in that we map names to patterns.
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        Called every time we care about the mapping of names to features.
       
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        Uses the mapping of names to features to return a PATTERN suitable
        for using the lib2to3 patcomp.
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        Implement a simple mapping to get patterns from names.
       
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