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How is this different from Pypy, other than the fact that ones uses RPython and the other uses Rust?

HolyJIT seems to be similar to RPython rather than Pypy: RPython is both the restricted language and the tooling around it, Pypy is a Python interpreter implemented using RPython.

PyPy is a tracing JIT and mozilla abandoned their tracing JIT efforts (TraceMonkey) a few years ago.

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