If I understand correctly, you mean manually writing code that patches the result of an action to the last output. That seems like a great approach for a simpl

If I understand correctly, you mean manually writing code that patches the result of an action to the last output. That seems like a great approach for a simple transformation pipeline. For a full compiler it seems harder to pull off. That's the great thing about memorization: It more or less let's you write the compiler like you would have done without it.