module Less::StyleSheet::Import1

def build_with_sass(env)
  line = input.line_of(interval.first)
  import = Sass::Tree::ImportNode.new(url.value.gsub(/\.less$/, ''))
  import.line = input.line_of(interval.first)
  env << Node::SassNode.new(import)
  old_rules = env.rules.dup
  build_without_sass env
  (env.rules - old_rules).each {|r| r.hide_in_sass = true}
rescue ImportError => e
  raise Sass::SyntaxError.new("File to import #{url.text_value} not found or unreadable", :line => line)
end