Code 3

package main

import (
    "fmt"
)

func hasBlock(x, y int) bool {
    if x < 0 || x >= 1 {
        return false
    }
    return true
}

func main() {
    ok := false

    for x := 0; x < 1; x++ {
        for y := 0; y < 1; y++ {
            if !hasBlock(x - 1, y) {
                ok = true
            } else {
                fmt.Println(x, y, hasBlock(-1, 0), hasBlock(x - 1, y))
            }
        }
    }

    if !ok {
        fmt.Println("A bug?")
    }
}