Now all you have to do is get a Go programmer to write code like this:

    if somethingElse {
        err := baz()  
        log.Println(err)
    }

Good luck!

As for your first example,

    // if only err2 failed, returns nil!

Yes, that's an accurate description of what the code you wrote does. Like, what? Whatever point you're trying to make still hinges on somebody writing code like that, and nobody who writes Go would.

Now, can this result in bugs in real life? Sure, and it has. Is it a big deal to get a bug once in a blue moon due to this? No, not really.