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  1. or download this
    $ perl -
warn \my %hash;
warn \my(%hash);
...
warn \my(%hash);
warn \(my(%hash));
- syntax OK
  2. or download this
    $ perl -le " warn scalar(\my %hash)"
HASH(0x99aa34) at -e line 1.
...

$ perl -MData::Dump -le " dd scalar(\my(%hash))"
\undef