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```
use warnings;
use strict;
...
1;

}
```

foo
Use of uninitialized value in subroutine dereference at script.pl line
+ 30.
...
baz
baz
    (in cleanup) Unable to create sub named "" at script.pl line 30.

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```
foo
destroying...
baz
baz
```

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    my $closure_self = $self;
    weaken $closure_self;
    $self->{sub} = \&One::foo;
    *One::foo = sub { $closure_self->{x} = 'x'; return "baz\n"; };
    return $self;

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```
foo
baz
destroying...
foo
```

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sub DESTROY {
    use Data::Dump;
...
    print dd($self), "\n";
    $self->unmock;
}

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```
foo
destroying...
...
1
baz
baz
```

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foo
baz
...
bless({ sub => sub { ... }, x => "x" }, "Count")
1
foo

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sub unmock {
    my $self = shift;
    *One::foo = $self->{sub};
}