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  1. or download this
    use strict;
use warnings;
...
warn "Doesn't Exist!" unless exists &CORE::GLOBAL::sleep;
*CORE::GLOBAL::sleep =sub {42};
warn "Exists!" if exists &CORE::GLOBAL::sleep;
  2. or download this
    Doesn't Exist! at d:/Users/lanx/pm/core_sleep.pl line 4.
Exists! at d:/Users/lanx/pm/core_sleep.pl line 6.