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Calls to .has_key() methods are expressed in terms of the 'in'
operator:

    d.has_key(k) -> k in d

CAVEATS:
1) While the primary target of this fixer is dict.has_key(), the
   fixer will change any has_key() method call, regardless of its
   class.

2) Cases like this will not be converted:

    m = d.has_key
    if m(k):
        ...

   Only *calls* to has_key() are converted. While it is possible to
   convert the above to something like

    m = d.__contains__
    if m(k):
        ...

   this is currently not done.
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            )
            ')'
        >
        after=any*
    >
    |
    negation=not_test<
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            trailer<
                '('
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                | arglist<(not argument<any '=' any>) arg=any ','>
                )
                ')'
            >
        >
    >
    c

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