It would have been nice to see the compiler implemented in the language itself. I'm a little skeptical of any language that can't be used to compile itself.
Other than being hard to achieve (often being a secondary goal), Julia gives very good reasons why not to strive for this goal: it may influence the language design in undesired ways, e.g. By removing the focus from high-level features to low level system design features
I'd like to rewrite cito to Ć at some point. One problem is that it's written in a fairly recent C#, so either Ć would need to catch up with two decades of C# development or the codebase be downgraded to an older language.
And we all use JavaScript NOT implemented in JavaScript. ;)
I'm a little skeptical of JS too!
The compiler is implemented in the language itself.