[apta]

    fmt.Println("foo")

I don't see errcheck complaining there

how about (taken from here: (https://www.reddit.com/r/programming/comments/ak305l/goodbye...):

    r1, err := fn1()
    r2, err = fn2()
    if err != nil {
      return err
    }

err check doesn't complain either

[oconnor663]

That second example is really surprising. This sort of thing happens all the time in production when lines get moved around. Does anyone know why errcheck misses it?

[agnivade]

Not sure about that. But https://github.com/gordonklaus/ineffassign catches that.