[Nitro] Small inheritor issue

[TRANS]

Found a little problem with inheritor:

  module X
    inheritor :x, {}, :merge
  end

  class Module
    include X
  end

But it works if you do:

  class Module
    inheritor :x, {}, :merge
  end

The reason is b/c of this code in inheritor.rb which decides how to
load the inheritor code (store in the Proc deflambda) into the
container.

    if self == Class or self == Module
      class_eval &deflambda
    elsif is_a?(Class)
      (class << self; self; end).class_eval &deflambda
    elsif is_a?(Module)
      class_inherit &deflambda
    else # other Object
      (class << self; self; end).class_eval &deflambda
    end

The is_a?(Module) part is the most important is actaully the reason
inheritor exists at all --i.e. modules aren't class-level inheirtable
(which sucks to no end).

T.