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  1. or download this
    my $subname = "package::sub";
if (my $coderef = main->can($subname)) {
  $coderef->(@args);
}
  2. or download this
    use strict;
my $coderef = \&$subname;
$coderef->(@args);
  3. or download this
    perldoc strict:
There is one exception to this rule:

                 $bar = \&{'foo'};
                 &$bar;