Go Brain Teasers

Puzzle 19

To Err or Not to Err

error.go

package main

import (
        "fmt"
)

type OSError int

func (e *OSError) Error() string {
        return fmt.Sprintf("error #%d", *e)
}

func FileExists(path string) (bool, error) {
        var err *OSError
        return false, err // TODO
}

func main() {
        if _, err := FileExists("/no/such/file"); err != nil {
                fmt.Printf("error: %s\n", err)
        } else {
                fmt.Println("OK")
        }
}

Guess the Output
	Try to guess what the output is before moving to the next page.