code: private Mixin parseMixin() {
          tokenizer.consumeExpectedKeyword(KEYWORD_MIXIN);
          Mixin mixin = new Mixin();
          parseName(mixin);
          parseParameterNames(mixin);
          parseMixinAttributes(mixin);
  
          return mixin;
      }
docs: /*
  Parse @mixin which are essentially template sections...