would you be willing to share the link to the source? (before I click the link to run ...)
There's a link to the repo in the top right corner of the "IDE".
Generated with CodeMate
That's a bit unfortunate, looked a bit impressive at a first glance. The only document which clearly lays out the comparison between rustc and the project itself has been is Chinese, as well.
An interesting scaffold, I suppose. And as long as you had fun .. coding? engineering? prompting the CodeMate's server?.. yourself, that's all that matters. I don't think I'll ever have any use for something of this sort myself, but some other folks might. Good job vibes!
Speaking of possible uses, it might form an e-judge system (automatically testing programs meant to solve a certain task) working on client side mainly.
Though test delivery system won't be trivial for it. Either the testset is on server and then client cannot run the solution on them, or it is delivered with DRM-like methods which won't allow to export the tests out. (Good luck protecting against timing attacks.)
The counterpart, not making server judge the solution all again, is easier: zero knowledge WASM execution.
To the poster and their coding agent: syn::parse_file might be of interest to you! After all, it reimplements the full Rust parser including closures, lifetimes and all that.