class LoadError
  REGEXPS = [
    /^no such file to load -- (.+)$/i,
    /^Missing \w+ (?:file\s*)?([^\s]+.rb)$/i,
    /^Missing API definition file in (.+)$/i,
  ]

  def path
    @path ||= begin
      REGEXPS.find do |regex|
        message =~ regex
      end
      $1
    end
  end

  def is_missing?(location)
    location.sub(/\.rb$/, '') == path.sub(/\.rb$/, '')
  end
end

MissingSourceFile = LoadError