draws.reserve( _effects.size() );
In nix-effects, this trampoline is the evaluation loop for a freer monad interpreter. A computation is a chain of algebraic effects: send "get" null, then send "put" 42, then more effects, possibly thousands deep. A naive recursive interpreter would call itself for each one, building stack proportional to chain length. With the trampoline, each effect is one genericClosure step: the operator calls the handler, which returns a resume value (feed to the continuation, keep going) or an abort value (discard the continuation, halt immediately). Continuations compose via an FTCQueue, a purely functional queue with O(1) snoc and amortized O(1) uncons, which eliminates the left-nesting pathology that makes naive free monads quadratic.
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That's a lot to take in. Let's pause for a second and enjoy a nice game. Play
结构化提取（对话精炼为结构化状态：目标/事实/决策/待解决问题）
You can also translate let expressions to lambda calculus, too. For example, instead of saving something to a file we can just use a let expression to temporarily define something within a program.