Rspec Steps C0 Coverage Information - RCov

           # ruby > 1.8.6

           return module_exec(*args, &block) if respond_to?(:module_exec)

           # If there are no args and the block doesn't expect any, there's no

           # need to fake module_exec with our hack below.

           # Notes:

           #   * lambda {      }.arity # => -1

           #   * lambda { ||   }.arity # =>  0

           #   * lambda { |*a| }.arity # => -1

           return module_eval(&block) if block.arity < 1 && args.size.zero?

           orig_singleton_methods = singleton_methods

           instance_eval_with_args(*args, &block)

           # The only difference between instance_eval and module_eval is static method defs.

           #   * `def foo` in instance_eval defines a singleton method on the instance

           #   * `def foo` in class/module_eval defines an instance method for the class/module

           # Here we deal with this difference by defining an instance method for

           # each new singleton method.

           # This has the side effect of duplicating methods (all new class methods will

           # become instance methods and vice versa), but I don't see a way around it...

           (singleton_methods - orig_singleton_methods).each { |m| define_method(m, &method(m)) }

         end

       end

     end

   end

 end