Go语言中错误处理实例分析

package main
import (
    "fmt"
    "time"
)
type MyError struct {
    When time.Time
    What string
}
func (e *MyError) Error() string {
    return fmt.Sprintf("at %v, %s",
        e.When, e.What)
}
func run() error {
    return &MyError{
        time.Now(),
        "it didn't work",
    }
}
func main() {
    if err := run(); err != nil {
        fmt.Println(err)
    }
}