our $foo;
{
  our $foo = 'foo'; say $foo;
}
{
  package Foo;
  our $foo = 'bar'; say $foo;
}
package main; say $foo;
package Foo; say $foo;
{
  package Foo;
  our $foo; say $foo;
  {
    package Bar;
    our $foo = 'quux'; say $foo;
  }
  say $foo;
}
{
  package Foo;
  say $foo;
}
__END__
foo
bar
foo
foo
bar
quux
bar
foo