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> but Rust's type system did catch this error - and then author decided it's fine to panic if this error happens

The issue is that it wasn't fine to panic, thus Rust did not catch this error.

Come on now. You can't blame the compiler when the programmer explicitly told the compiler to not worry about it. There is nothing in existence that can protect against something like that.

I'm not blaming the compiler, of course programmers can explicitly write incorrect code in any language. It's not Rust's fault.

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