------------------------------------------------------------------- String methods related to templates ES6 Draft 03-17-2015, section 21.1.2.4
function StringRaw(callSite) {
  "use strict";
  var numberOfSubstitutions = arguments.length;
  var cooked = TO_OBJECT(callSite);
  var raw = TO_OBJECT(cooked.raw);
  var literalSegments = TO_LENGTH(raw.length);
  if (literalSegments <= 0) return "";

  var result = TO_STRING(raw[0]);

  for (var i = 1; i < literalSegments; ++i) {
    if (i < numberOfSubstitutions) {
      result += TO_STRING(arguments[i]);
    }
    result += TO_STRING(raw[i]);
  }

  return result;
}