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sub plan {
    croak "Test::plan(%args): odd number of arguments" if @_ & 1;
    croak "Test::plan(): should not be called more than once" if $planned;

    local($\, $,);   # guard against -l and other things that screw with
                     # print

    _reset_globals();

    _read_program( (caller)[1] );

    my $max=0;
    while (@_) {
	my ($k,$v) = splice(@_, 0, 2);
	if ($k =~ /^test(s)?$/) { $max = $v; }
	elsif ($k eq 'todo' or
	       $k eq 'failok') { for (@$v) { $todo{$_}=1; }; }
	elsif ($k eq 'onfail') {
	    ref $v eq 'CODE' or croak "Test::plan(onfail => $v): must be CODE";
	    $ONFAIL = $v;