BlankSlate.reveal(name) doesn't work with blocks

Vendor-ed Builder gem v.2.1.2 has broken reveal(..) method. It doesn't support definition of revealing methods which need support of blocks.

Here's current implementation of BlankSlate.reveal() method:

def reveal(name)
  bound_method = nil
  unbound_method = find_hidden_method(name)
  fail "Don't know how to reveal method '#{name}'" unless unbound_method
  define_method(name) do |*args|

bound_method ||= unbound_method.bind(self)
bound_method.call(*args)

  end
end

Here's one which works fine:

def reveal(name)
  bound_method = nil
  unbound_method = find_hidden_method(name)
  fail "Don't know how to reveal method '#{name}'" unless unbound_method
  define_method(name, unbound_method)
end

Example:

class MyClass < BlankSlate







 reveal :returning







 def just_method
   returning do 

 return 'testing return value'

   end
 end



end

I've tried implement this as current implementation with block support like:

def reveal(name)
  bound_method = nil
  unbound_method = find_hidden_method(name)
  fail "Don't know how to reveal method '#{name}'" unless unbound_method
  define_method(name) do |*args, &block|

bound_method ||= unbound_method.bind(self)
bound_method.call(*args, &block)

  end
end

But because Ruby 1.8 doesn't support this syntax and it's going to work only on 1.9 I've decided to use old way with passing name:

  ...
  define_method(name, unbound_method)
  ...