makeIfConsequent() {
    const context = this.choiceContext;
    const forkContext = this.forkContext;

    /*
     * If any result were not transferred from child contexts,
     * this sets the head segments to both cases.
     * The head segments are the path of the test expression.
     */
    if (!context.processed) {
      context.trueForkContext.add(forkContext.head);
      context.falseForkContext.add(forkContext.head);
      context.qqForkContext.add(forkContext.head);
    }

    context.processed = false;

    // Creates new path from the `true` case.
    forkContext.replaceHead(context.trueForkContext.makeNext(0, -1));
  }
Makes a code path segment of the `if` block.
@returns {void}