That's absolutely not true. Differently languages have greater or lesser representation in the training sets. You see a similar bias toward specific libraries within a given ecosystem, so much so that I worry about AI created technical monocultures as AI generated code converges to specific languages, packages, etc.
The LLM companies have truly astounding power to now steer the direction of the entire industry. It should worry all of us.
Rust does not have a bigger training set than say Python/JS/TypeScript/C++ .
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That's not all there is to it, to be fair. Rust seems to work particularly well for LLMs in part because it's better at catching their errors.