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Most memory-safe languages I've used self-host their compiler and standard library (i.e. they're written in the language itself).

> Most memory-safe languages I've used self-host their compiler and standard library (i.e. they're written in the language itself).

Well, yes, but there is also (usually) a bootstrapping phase before a language is self-hosting, and if you're sufficiently paranoid the 'Trusting Trust' meta-vulnerability comes into play and isn't easily dismissed.

A memory safe language can be written in itself.

I think it comes from that rewrite everything in Rust camp.