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sub new {
   my ($class, %arg) = @_;

   $in     = $arg{in}  || *STDIN;
   $out    = $arg{out} || *STDOUT;
   $prompt = $arg{prompt} // "> ";
   $cb     = $arg{on_line} || $arg{cb}
      or do { require Carp; Carp::croak ("AnyEvent::ReadLine::Gnu->new on_line callback argument mandatry, but missing") };

   $self = $class->SUPER::new ($arg{name} || $0, $in, $out);

   $Term::ReadLine::Gnu::Attribs{term_set} = ["", "", "", ""];
   $self->CallbackHandlerInstall ($prompt, \&on_line);

   $hidden = 1;
   $self->show;

   $self
}