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  1. or download this
    #!/usr/bin/perl
use warnings;
...
say defined &My::one;          # 1
say defined &My::two;          #
say defined &My::three;        #
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    sub four (&@);
# ...
say ${My::}{four};             # &@
  3. or download this
    sub five (&@) :method;
say ${My::}{five};             # *My::five