本篇技术指南围绕 fpinscala 仓库第 5 章（laziness）练习 5.6 的官方答案展开，完整讲解如何基于非严格求值的 foldRight 为惰性列表 LazyList 实现 headOption，并借助源码与测试深入剖析其类型推导路径 ...
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