title: pry-nav work unexpectedly
body: <p>I put <code>binding.pry</code> in my script,</p>
  
  <p>But now when it's stopped at the breakpoint,</p>
  
  <p>is shows me that information.</p>
  
  <p>Which is out of my expectation, how to fix it ?</p>
  
  <p>Frame number: 0/11</p>
  
  <pre><code>From: /Users/me/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/pry-nav-0.2.4/lib/pry-nav/tracer.rb @ line 21 PryNav::Tracer#run:
  
      12: def run(&amp;block)
      13:   # For performance, disable any tracers while in the console.
      14:   # Unfortunately doesn't work in 1.9.2 because of
      15:   # http://redmine.ruby-lang.org/issues/3921. Works fine in 1.8.7 and 1.9.3.
      16:   stop unless RUBY_VERSION == '1.9.2'
      17:
      18:   return_value = nil
      19:   command = catch(:breakout_nav) do      # Coordinates with PryNav::Commands
      20:     return_value = yield
   =&gt; 21:     {}    # Nothing thrown == no navigational command
      22:   end
  </code></pre>