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Rust isn't just a language, though.

Additionally, unlike some languages that are formally specified before turning to implementation, Rust has subscribed to design-by-implementation. The implementation is the language.

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That just means the semantics of the language are defined by whatever the default implementation does. It's a big stretch to conclude that means Rust 'was' OCaml in some sense when the compiler was written with it. Especially now the Rust compiler is written in Rust itself.

You're overthinking again. Read what is said, not what you want it to say in some fairytale land.

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