Update on the Mu computer's memory-safe language

Mu now checks for most variable accesses if the variable is still live, and it's register hasn't been clobbered by some other variable. The extra-burdensome parts of programming in Mu are hopefully now not very burdensome.

Next up: testable syscalls for screen and keyboard. But I might take a break first. My RSI has been acting up.

https://github.com/akkartik/mu

This post is part of my Freewheeling Apps Devlog.

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