Eccezioni stile Java in GO.
  - Blog panic & recover: https://go.dev/blog/defer-panic-and-recover
  - Libreria completa: https://hackthology.com/exceptions-for-go-as-a-library.html
  - Implementazione semplificata: https://hackthology.com/exceptions-for-go-as-a-library.html

package main
 
import (
    "fmt"
)
 
type Block struct {
    Try     func()
    Catch   func(Exception)
    Finally func()
}
 
type Exception interface{}
 
func Throw(up Exception) {
    panic(up)
}
 
func (tcf Block) Do() {
    if tcf.Finally != nil {
 
        defer tcf.Finally()
    }
    if tcf.Catch != nil {
        defer func() {
            if r := recover(); r != nil {
                tcf.Catch(r)
            }
        }()
    }
    tcf.Try()
}
 
func main() {
    fmt.Println("application started")
    Block {
        Try: func() {
            fmt.Println("this is good")
            Throw("Oh,no...!!")
        },
        Catch: func(e Exception) {
            fmt.Printf("Caught %v\n", e)
        },
        Finally: func() {
            fmt.Println("finally keep runs")
        },
    }.Do()
    fmt.Println("application shutdown")
}

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