String#index works incorrectly with FixNum parameters
-----------------------------------------------------

                 Key: JRUBY-1795
                 URL: http://jira.codehaus.org/browse/JRUBY-1795
             Project: JRuby
          Issue Type: Bug
          Components: Core Classes/Modules
    Affects Versions: JRuby 1.x
         Environment: Latest JRuby 1.1b1
            Reporter: Vladimir Sizikov
         Attachments: string-index-fixnum.patch

{noformat}
puts "hello".index(256 * 3 + ?e)
puts "hello".index(-(256 - ?e))
{noformat}

In JRuby returns:
1
1

In MRI returns:
nil
nil

This leads to one rubinius spec failure.

The proposed patch fixes the problem.


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