The MustCreate Pattern for Go Tests

A fun quirk about Go that nobody tells you about is that a function with multiple return values can supply multiple arguments. So this:

    func must[T any](t T, err error) T {
        if err != nil {
            panic(err)
        }
        return t
    }
    
    func makeInt(i int) (int, error) {
        if i == 0 {
            return 0, fmt.Errorf("not zero")
        }
        return i, nil
    }
    
    func main() {
        i := must(makeInt(3))
    }

is totally legal & works exactly how you'd expect it to!