// $ tree
// .
// ├── main.go
// ├── second.go

// ```go build main.go```
// or
// ```go build .```


// file: main.go
package main

import (
	"fmt"
)

func main() {
	fmt.Println("this is package MAIN")
}

// file: second.go
package main

import (
	"fmt"
)

func main() {
	fmt.Println("this is package SECOND")
}