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         exec $exe, qw(--interpreter=mi2 -q), @$arg;
         kill 9, 0; # don't want to load the POSIX module just for this
      } else {
         Carp::croak "cannot fork: $!";
      }
   }

   AnyEvent::Util::fh_nonblocking $self->{fh}, 1;

   {
      Scalar::Util::weaken (my $self = $self);
      $self->{rw} = AE::io $self->{fh}, 0, sub {
         my $len = sysread $self->{fh}, $self->{rbuf}, 256, length $self->{rbuf};

         defined $len || $self->eof;

         $self->feed ("$1")
            while $self->{rbuf} =~ s/^([^\r\n]*)\r?\n//;
      };

      $self->{wcb} = sub {