&$key() if main->can($key);
is not strict safe, but: 
if (my $sub = main->can($key)) {
  $sub->();
}

[download]
also nice (but maybe too obfuscated?) would be (main->can($key)||sub{})->();

In reply to Re: Re: Subroutines reference from data by tinita
in thread Subroutines reference from data by Syrkres

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