code: protected Map<String, String> initializeHighlightedIdentifiers() {
  		Map<String, String> result = Maps.newHashMap();
  		for (Primitive p : Primitives.Primitive.values()) {
  			result.put(p.name().toLowerCase(), KEYWORD_ID);
  		}
  		for (String name : SPECIAL_FEATURE_NAMES) {
  			result.put(name, KEYWORD_ID);
  		}
  		return result;
  	}
docs: Returns a mapping from identifier (e.g. 'void', 'int', 'this') to highlighting ID. May not return
  <code>null</code>.
  
  @return a mapping from identifier (e.g. 'void', 'int', 'this') to highlighting ID.