Example Code

example.go

package main

import (
	"fmt"
	"os"
)

func foo(i int) int {
	throw_if (i == 42,"foo: 42 not supported")	
	
	return 2*i
}

func bar(s string) string {
	throw_if (s == "baz","bar: 'baz' not supported")
	
	return s + s
}

func throw(msg string) {
	panic(os.NewError(msg))
}

func throw_if(condn bool, msg string) {
	if condn {
		throw(msg)
	}
}

func catch(perr *os.Error) {
	if e := recover(); e != nil {
		*perr = e.(os.Error)
	}
}

func z() (x int, y string, err os.Error) {
	defer catch (&err)
	
	x = foo(2)
	y = bar("")
	y += bar("baz")
	x += foo(42)
	return
}

func main() {
	fmt.Println(z()...)
}