Btw, wasn’t being dismissive of your effort - I only linked to the article 
(which is pretty old) because it covers many of the same ideas you were 
discussing - and whenever I get the chance to link to something involving Knuth 
I am going to take it :)

> On Nov 18, 2024, at 12:02 PM, Romain Doumenc <romain@trout.software> wrote:
> 
> Hi Roger,
> 
> Glad you found this interesting, and thank you for reading !
> 
> One can obviously always use methods on a structure instead of
> coroutines (in the example I provided, the state could be stored in
> the tokenizer), and the question is when storing the state on the Go
> stack directly makes code more readable – and yes, a lot of what
> “readable” means is colored by one’s own experience.
> I think the largest benefit does not stem from the feedback from the
> parser to the tokeniser (although I do find it very cute), but instead
> from the ability of the parent routine to restart the parser when an
> error is found. With coroutines, this can be expressed as a simple for
> loop; but I have not seen something as neat with other methods –
> either stack unwinding (hard to maintain invariants) or instead
> pushing deep down in the parser the knowledge about how much tokens to
> throw away.
> 
> My goal in reaching code currently hidden in the library was to see
> how much more we could do if we had full coroutines, and not making
> any claim about finding a “best” or even a “better” approach. Looking
> forward to seeing what you create with iterators!
> 
> Best
> --
> Romain
> 
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