I am fascinated to learn that Multics (the Unix predecessor) was a big influence on the lisp condition system (i.e. resumable exceptions)!
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Every time I implement an interpreter with recursion, I regret it.
As soon as I want TCO, or userland control of stack limits, or resumable exceptions, I need my own stack.
This is awkward because it's an upfront design decision. Changing the stack model is a big refactoring.
Switching between Rust and TypeScript, I really miss the Result type in TypeScript. I can kludge something with nullable types or exceptions, but it's not as nice for the caller.
Python is adding column numbers to its exceptions, making tracebacks way more readable!
