Unexpected productivity boost of Rust

>The code will compile just fine. The Zig compiler will generate a new number for each unique 'error.*'

This is wild. I assume there's at least the tooling to catch this kind of errors right?

There's no special tooling to catch this, because nobody catches an error with if-else—it's simply not idiomatic. Everyone uses switch statements in the catch block, and I've never seen anybody using anything other than switch, when catching an error.