Comment by pjmlp

Many compilers are bootstrapped.

Ruby is partially written in Rust nowadays.

VSCode uses plenty of Rust and .NET AOT on its extensions, alongside C++, and more recently Webassembly, hence why it is the only Electron garbage with acceptable performance.

Unity and Unreal share a great deal of games, with plenty of C#, Blueprints, Verse, and a GC for C++.