array.c: bsearch_index
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50839 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
array.c: bsearch_index
method, which is similar to bsearch and returns the index or
nil. [Feature #10730]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50839 b2dd03c8-39d4-4d8f-98ff-823fe69b080e