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  1. or download this
    PackageName->can('sub_name');
  2. or download this
    $PAGE = "test_function_a";
eval "$PAGE" if main->can($PAGE);
  3. or download this
    my %dispatch = (
   'test_function_a' => \&test_function_a,
...
   die "Package main doesn't seem able to '$func'" unless main->can($f
+unc);
   $dispatch{$func}->();
}