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    $anon_scalar_ref = \eval{undef};        # or ...
$anon_scalar_ref = \eval{ $init_val };  # if you prefer anon scalar in
+itialized
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    #!/usr/bin/perl

...
print Dump($a);
print Dump($c);
print Dump($d);
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    29
25
...
  SV = NULL(0x0) at 0x224fbc
    REFCNT = 1
    FLAGS = ()