binding from inside c method

binding.rb

gem 'RubyInline'
require 'inline'

class Test
  inline do |builder|
    builder.include "<time.h>"
    builder.c_raw <<-SRC, :arity => 1
      VALUE dummy(VALUE self, VALUE arg){
        VALUE ret = rb_funcall(self, rb_intern("binding"), 0);
        return ret;
      }
    SRC
  end
end

binding_from_method = Test.new.dummy(123)
puts binding_from_method.local_variables.inspect