* bignum.c (rb_big2dbl), test/ruby/test_bignum.rb (test_to_f):
	  A negative Bignum out of Float range should be converted to -Infinity.
	  [ruby-core:30492] [Bug #3362]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@35941 b2dd03c8-39d4-4d8f-98ff-823fe69b080e