The C++ standard for the F-35 Fighter Jet [video]

a = a; // misra

Actual code i have seen with my own eyes. (Not in F-35 code)

Its a way to avoid removing an unused parameter from a method. Unused parameters are disallowed, but this is fine?

I am sceptical that these coding standards make for good code!

Zig makes it explicit with

    _ = a;

And you would encounter it quite often because unused variable is a compilation error: https://github.com/ziglang/zig/issues/335

Golang is exactly the same.

It's extremely annoying until it's suddenly very useful and has prevented you doing something unintended.