Implement Parser for ! (never)

[zesterer]

This will allow the use of todo!() in places that expect a parser.

[msrd0]

I don't see how this would replace your existing parser? todo!() panics as soon as it's being called, i.e. when constructing the parser, while your todo parser (if I understood it correctly) only panics when it's used to parse something, not when it's being constructed.

[zesterer]

This is true, it wouldn't be a substitute. It would be nice to have it just compile though. Thanks for pointing this out!

[dvdvgt]

Hi! I really enjoyed using chumsky. I found the documentation really helpful, especially the tutorial on creating a little programming language. Thus, I'd like to contribute to this project. May I take this issue on? Is it still relevant?

I've read that the zero-copy branch resulted in a rewrite of most of the core functionality. Might it be more sensible to postpone further contributions until the zero-copy branch is merged with the release of Rust 1.65?

[zesterer]

Yes, this would be a good thing to implement in zero-copy rather than master. One problem is that in zero-copy, the output type is an associated type which might preclude implementing this.