* array.c (rb_ary_slice_bang): Be consistent with Array#slice()

  and String#slice!().  Just return nil when a negative length or
  out of boundary index is given instead of raising an exception
  via internal functions.
  (rb_ary_slice_bang): should not use rb_ary_subseq() which shares
  internal pointer.  splice modifies the receiver right after
  subseq.  [ruby-dev:34005]
  (rb_ary_slice_bang): should adjust length before making
  sub-array.

* enumerator.c (Init_Enumerator): Override
  Enumerable::Enumerator#each_with_index with #with_index.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@16582 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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