class Middleman::Renderers::HamlTemplate

in. So we have to resort to heavy hackery :(
thus making it impossible to pass our Middleman instance
Haml precompiles filters before the scope is even available,

def evaluate(scope, locals, &block) 

def evaluate(scope, locals, &block)
  options = @options.merge(filename: eval_file, line: line, context: @context || scope)
  @engine = ::Haml::Engine.new(data, options)
  output = @engine.render(scope, locals, &block)
  output
end

def initialize(*args, &block) 

def initialize(*args, &block)
  super
  @context = @options[:context] if @options.key?(:context)
end

def prepare 

def prepare
end