I use Rust and C at work. I quite enjoy Rust, but I currently have no reason to believe C won't outlive it, by a lot.
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The way I see it, the longer something is actively used, the greater the chance it’s going to stick around. I’m bullish on rust but I’m equally bullish that C will last a long, long time.
But it’s not an either-or here. Both are good at certain things and can coexist. Like they’re coexisting in the Linux kernel for example.