From: Xavier Shay <contact@...>
Date: 2008-10-10T00:22:03+09:00
Subject: Enumerating constants in anonymous modules

How can I enumerate all the constants inside the module in the second
example?
Notice that #constants array is empty

For bonus points, which is the "correct" eval method to use to define a
class inside the module (they all seem to work)

Cheers,
Xavier

module Foo
  class A
  end
end

puts Foo.constants.inspect # => ["A"]

[:module_eval, :instance_eval, :class_eval].each do |method|
  m = Module.new
  m.send(method) do
    class B
    end
  end
  puts m.constants.inspect      # => [] (I would expect ['B'])
  puts m.const_get('B').inspect # => B
end
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