code: function (parsedName) {
                  var lookups, important, i = parserInput.i,
                      inValue = !!parsedName, name = parsedName;
  
                  parserInput.save();
  
                  if (name || (parserInput.currentChar() === '@'
                      && (name = parserInput.$re(/^(@[\w-]+)(\(\s*\))?/)))) {
  
                      lookups = this.mixin.ruleLookups();
  
                      if (!lookups && ((inValue && parserInput.$str('()') !== '()') || (name[2] !== '()'))) {
                          parserInput.restore('Missing \'[...]\' lookup in variable call');
                          return;
                      }
  
                      if (!inValue) {
                          name = name[1];
                      }
  
                      if (lookups && parsers.important()) {
                          important = true;
                      }
  
                      var call = new tree.VariableCall(name, i, fileInfo);
                      if (!inValue && parsers.end()) {
                          parserInput.forget();
                          return call;
                      }
                      else {
                          parserInput.forget();
                          return new tree.NamespaceValue(call, lookups, important, i, fileInfo);
                      }
                  }
  
                  parserInput.restore();
              }
docs: Call a variable value to retrieve a detached ruleset or a value from a detached ruleset's rules.  @fink(); @fink; color: @fink[@color];