4 func fn1() (error, int) { return nil, 0 } // want `error should be returned as the last argument`
5 func fn2() (a, b error, c int) { return nil, nil, 0 } // want `error should be returned as the last argument`
6 func fn3() (a int, b, c error) { return 0, nil, nil }
7 func fn4() (error, error) { return nil, nil }
8 func fn5() int { return 0 }
9 func fn6() (int, error) { return 0, nil }
10 func fn7() (error, int, error) { return nil, 0, nil }