[Go] Passing boolean as error.

package main

import (
    "log"
)

func main() {
    m := map[int]string{
        1: "one",
        2: "two",
        3: "three",
    }

    v, ok := m[1]
    if !ok {
        log.Fatal("Unable to retrieve key/value pair")
    }

    if !(v == "one") {
        log.Fatal("Wrong value")
    }
}