docs: function () {
              this.parseOnly = true;
              // disables functions which are only useful to generate code:
              var empty = Aria.empty;
              this.writeDependencies = empty;
              this.newVarName = empty;
              this.writeln = empty;
              this.write = empty;
              this.wrapExpression = empty;
              this.trackLine = empty;
          }