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    $block->set_value(_section_order => $section_order);
    return $block;
}

sub _spec_init {
    return $self->_spec_string
      if $self->_spec_string;
    local $/;
    my $spec;
    if (my $spec_file = $self->_spec_file) {
        open FILE, $spec_file or die $!;
        $spec = <FILE>;
        close FILE;
    }
    else {    
        $spec = do { 
            package main; 
            no warnings 'once';
            <DATA>;
        };
    }
    return $spec;
}

sub _strict_warnings() {
    require Filter::Util::Call;
    my $done = 0;
    Filter::Util::Call::filter_add(
        sub {
            return 0 if $done;
            my ($data, $end) = ('', '');
            while (my $status = Filter::Util::Call::filter_read()) {
                return $status if $status < 0;
                if (/^__(?:END|DATA)__\r?$/) {
                    $end = $_;
                    last;
                }
                $data .= $_;
                $_ = '';
            }
            $_ = "use strict;use warnings;$data$end";
            $done = 1;
        }
    );
}

sub tie_output() {
    my $handle = shift;
    die "No buffer to tie" unless @_;
    tie $handle, 'Test::Base::Handle', $_[0];
}

sub no_diff {
    $ENV{TEST_SHOW_NO_DIFFS} = 1;
}

package Test::Base::Handle;

sub TIEHANDLE() {
    my $class = shift;
    bless \ $_[0], $class;
}

sub PRINT {
    $$self .= $_ for @_;
}

#===============================================================================
# Test::Base::Block
#
# This is the default class for accessing a Test::Base block object.
#===============================================================================
package Test::Base::Block;
our @ISA = qw(Spiffy);

our @EXPORT = qw(block_accessor);

sub AUTOLOAD {
    return;
}

sub block_accessor() {
    my $accessor = shift;
    no strict 'refs';
    return if defined &$accessor;
    *$accessor = sub {
        my $self = shift;
        if (@_) {
            Carp::croak "Not allowed to set values for '$accessor'";
        }
        my @list = @{$self->{$accessor} || []};
        return wantarray
        ? (@list)
        : $list[0];
    };
}

block_accessor 'name';
block_accessor 'description';
Spiffy::field 'seq_num';
Spiffy::field 'is_filtered';
Spiffy::field 'blocks_object';
Spiffy::field 'original_values' => {};

sub set_value {
    no strict 'refs';
    my $accessor = shift;
    block_accessor $accessor
      unless defined &$accessor;
    $self->{$accessor} = [@_];
}

sub run_filters {
    my $map = $self->_section_map;
    my $order = $self->_section_order;
    Carp::croak "Attempt to filter a block twice"
      if $self->is_filtered;
    for my $type (@$order) {
        my $filters = $map->{$type}{filters};
        my @value = $self->$type;
        $self->original_values->{$type} = $value[0];