#!/usr/bin/env perl
use strict;
use warnings;
use feature qw(say);;

my $foo = qq(bar);

__END__

##</code><code>##

package main

func main() {
	foo := "bar"
}

##</code><code>##

./prog.go:4:2: foo declared and not used

Go build failed.

##</code><code>##

package main

import "fmt"

func main() {
	foo := "bar"
	fmt.Println(foo)
}

##</code><code>##

bar

Program exited.