my $package = 'main';
my $function = 'foo';

{
    no strict 'refs';
    if (defined &{$package.'::'$function}) {
        print "$function is defined in $package\n";
    }
}

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In reply to Re: checking from a module if a sub exists in main:: by dragonchild
in thread checking from a module if a sub exists in main:: by tune

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