[PATCH] RDoc parse_rb.rb: Logic for def Builtin.method() end

Moin.

RDoc used to generate warnings like this for this kind of code:

def Binding.of_caller(...) ... end

Couldn't find Binding. Assuming it's a module

Which does not make much sense because obviously Binding itself is a 
build-in Ruby class.

The attached patch looks up constant names in that context via 
Object.const_get (including support for X::Y style names). This means 
that there will be a few false positives as well for the classes that 
RDoc itself provides, but that is IMHO not too much of a problem.

The patch also supports the case where you're extending a Class or 
Module that has no other methods with a :nodoc: directive like in this case:

def Continuation.create(*args, &block) # :nodoc:
   ...
end

I hope that the RDoc maintainers are reading this list and will pick it 
up quickly.

Regards,
Florian Gross