how does something get tested for turing completeness

By building a simulated Turing machine, usually… or at least by demonstrating that all the components to do so are available.

@jackpot @KittyCat implementing a brainfuck interpreter for it is a useful method

Just about the only good reason for Brainfuck.

@frezik I mean that’s literally it’s purpose. being a minimal turing complete language.

I could be wrong, but I don’t think the creators envisioned it being a basis for easily proving the Turing Completeness of other languages, but it did. They were more thinking “how can I have the most fucked up language in the smallest package and still be Turning Complete?”

You port Doom to it.

Or linux.

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