Previous discussions of this:
- https://groups.google.com/g/julia-users/c/6FJ65U7n73M/discussion?pli=1
- https://github.com/JuliaLang/JuliaParser.jl/issues/78
- Julia written in Julia? - #13 by yuyichao
I think a fair summary is that implementing Julia in Julia is possible but would require a lot of effort without a clearly worthwhile reward.