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    my $sub = \&$name;
$sub->( @args )
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    die "No sub named `$name`" if !defined( &$sub );
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    $invocant->$name( @args )
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    my $method = $invocant->can( $name );
$invocant->$method( @args )
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    die "No method named `$name`" if !$method;