gistfile1.rb

## Sibling constant resolution/scoping
module X
  class Y; end
end

class X::Z
  def self.y
    Y
  end
end

X::Z.class_eval "Module.nesting" # [X::Y::Z]
X::Z.const_get(:Y) # uninitialized constant X::Z::Y
X::Z.y             # uninitialized constant X::Z::Y

## Parent constant resolution/scoping
module X
  class Y; end
end

class X::Y::Z
  def self.y
    Y
  end
end

X::Y::Z.class_eval "Module.nesting" # [X::Y::Z]
X::Y::Z.const_get(:Y) # uninitialized constant X::Y::Z::Y
X::Y::Z.y             # uninitialized constant X::Y::Z::Y