* bignum.c (rb_big_mul0): multiply two numbers (x, y) without

  normalizing the result.  x should be a big number.
  [ruby-dev:26778]

* bignum.c (rb_big_pow): use rb_big_mul0() instead of
  rb_big_mul().

* array.c (rb_ary_or, rb_ary_and, rb_ary_plus, rb_ary_diff):
  revert the change on 2005-08-03.  Set operation on other item
  should have in separate methods.

* parse.y (shadowing_lvar_gen): warn when arguments shadows
  external local variables.

* parse.y (f_opt): optional arguments should not clobber external
  local variables.

* parse.y (f_rest_arg): rest arguments should not clobber external
  local variables.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8963 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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