When the scope (the file) ends, the last reference to $foo is released, so it's detroyed.
If any function (incl END) referenced $foo, it would capture the variable. In that case, there would still be a reference to the variable at the end of the file scope, so the variable will survive until global destruction.
use strict;
use warnings;
sub Foo::DESTROY{ print "object $_[0]->[0] destroyed\n"; }
my $foo = bless [ 'foo' ], 'Foo'; # notice 'my'
our $bar = bless [ 'bar' ], 'Foo'; # notice 'our'
END {
$foo;
print "END block executed\n";
}
should produce
END block executed
object foo destroyed
object bar destroyed
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