RubySpec: self.send(:block_given?) always returns false
-------------------------------------------------------

                 Key: JRUBY-3746
                 URL: http://jira.codehaus.org/browse/JRUBY-3746
             Project: JRuby
          Issue Type: Bug
          Components: RubySpec
    Affects Versions: JRuby 1.3
            Reporter: Charles Oliver Nutter
            Priority: Trivial


This is probably because block_given? looks at the frame, and for better send 
performance we do not insert a frame for it. So with or without send, 
block_given? sees the actual caller's frame. Pretty trivial breakage.

{noformat}
self.send(:block_given?) always returns false FAILED
Expected true
 to equal false

/Users/headius/projects/jruby/spec/mspec/lib/mspec/expectations/expectations.rb:15:in
 `fail_with'
/Users/headius/projects/jruby/spec/mspec/lib/mspec/matchers/base.rb:9:in `=='
/Users/headius/projects/jruby/spec/ruby/core/kernel/block_given_spec.rb:38
{noformat}

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