Passing through multiple-value-return doesn't work well in Go

go_multiple_return.go

package main

import "fmt"

var m = map[string]int{"a": 1, "b": 2, "c": 3}

func lookup(k string) (int, bool) {
	// Can't do this :(
	//
	//return m[k]
	//
	// You'll get:
	//
	//     ./go_multiple_return.go:8: not enough arguments to return
	//
	// Instead, have to:
	v, ok := m[k]
	return v, ok
}

func main() {
	if v, ok := lookup("b"); ok {
		fmt.Printf("m[\"b\"] = %d\n", v)
	} else {
		fmt.Printf("key not found")
	}
}