<NME> static.rb
<BEF> # encoding: utf-8

require "rango/gv"

module Rango
  module GV
    def self.static(template, locals = nil, &hook)
      Rango::Mini.app do |request, response|
        path = template || request.env["rango.router.params"][:template]
        path = hook.call(path) unless hook.nil?
        path = "#{path}.html" unless path.match(/\./)
        Rango.logger.debug("Rendering '#{path}'")
        # Rango::RenderMixin.scope
        context = context.call(request) if context.respond_to?(:call) # lambda { |request| {msg: request.message} }
        Rango::RenderMixin.render path, scope, context
      end
    end

    # you would usually define module Static with instance method static for
    # including into controllers, but since controllers have render, it would be useless
  end
end

<MSG> GV doesn't need render mixin

<DFF> @@ -1,8 +1,11 @@
 # encoding: utf-8
 
 require "rango/gv"
+require "rango/mini"
+require "rango/mixins/render"
 
 module Rango
+  extend Rango::RenderMixin
   module GV
     def self.static(template, locals = nil, &hook)
       Rango::Mini.app do |request, response|

GV doesn't need render mixin