I can't reply to the reply to this one (guess the thread is getting too deep), but I just wanted to clarify that I'm not a rust critic, I use rust, I like rust, I have no problem with rust. OK great, moving on...

The lack of reply is probably because the thing you wanted to respond to was new.

This is a deliberate HN behaviour to discourage frantic conversations, like you might have if this was a Zoom call for example, or we'd had this disagreement in a bar (presumably a bar where there's a Compiler Explorer built in, or maybe literally Matt Godbolt is sat there with a laptop?)

Maybe it works? I have had some positive experiences.

If you know unsafe Rust the comparison to this Odin feature feels odd, but OK. Surely the Odin feature is more like when let-chains was unstable but you could tell the Rust nightly compiler you want that feature anyway ? Or... explicit_tail_calls which gives you a way to write explicit tail calls† in nightly Rust ?

† This is a very cool feature if you're a functional programmer using the "become" keyword, you get tail call optimisation but it's mandatory, if what you've written can't work as a tail call then it won't compile, if it could work it does.