How to use the @glimmer/reference.CURRENT_TAG.value function in @glimmer/reference

// currently rendering roots, a new root was added and will
      // be processed by the existing _renderRoots invocation
      return;
    }

    // used to prevent calling _renderRoots again (see above)
    // while we are actively rendering roots
    this._isRenderingRoots = true;

    let completedWithoutError = false;
    try {
      this._renderRoots();
      completedWithoutError = true;
    } finally {
      if (!completedWithoutError) {
        this._lastRevision = CURRENT_TAG.value();
        if (this._env.inTransaction === true) {
          this._env.commit();
        }
      }
      this._isRenderingRoots = false;
    }
  }

// when processing non-initial reflush loops,
        // do not process more roots than needed
        if (i >= initialRootsLength && !shouldReflush) {
          continue;
        }

        root.options.alwaysRevalidate = shouldReflush;
        // track shouldReflush based on this roots render result
        shouldReflush = root.shouldReflush = runInTransaction(root, 'render');

        // globalShouldReflush should be `true` if *any* of
        // the roots need to reflush
        globalShouldReflush = globalShouldReflush || shouldReflush;
      }

      this._lastRevision = CURRENT_TAG.value();

      env.commit();
    } while (globalShouldReflush || roots.length > initialRootsLength);

    // remove any roots that were destroyed during this transaction
    while (removedRoots.length) {
      let root = removedRoots.pop();

      let rootIndex = roots.indexOf(root);
      roots.splice(rootIndex, 1);
    }

    if (this._roots.length === 0) {
      deregister(this);
    }
  }