Many Rails users enjoyed this little gem developed by Florian Groß. But as Mauricio Fernandez noted in his blog, this extension is broken with the brand new Ruby 1.8.5. In order to make its magic possible, breakpoint library relied on the implementation of Binding.of_caller, which in turn relied on the bug in Ruby's implementation of trace calls. With new release, this bug has been patched.
Mauricio has started working of fixing this problem and proposed a new method binding_n(n), which would return a binding for any frame in the call stack. But you don't have to wait for his work to complete. ruby-debug has this functionality already implemented for you.
Consider this small snippet:
require "rubygems"
require 'ruby-debug'
module Kernel
def binding_n(n = 0)
frame = Debugger.current_context.frames[n+1]
raise "Unknown frame #{n}" unless frame
frame.binding
end
end
def test
puts eval("var", binding_n(1))
end
Debugger.start do
var = 'Hello'
test
end
And most likely, I will add this method to the next version of ruby-debug. It can be handy sometimes.
