晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/doc/perl-Test-Simple/t/Legacy/circular_data.t
#!/usr/bin/perl -w

# Test is_deeply and friends with circular data structures [rt.cpan.org 7289]

BEGIN {
    if( $ENV{PERL_CORE} ) {
        chdir 't';
        @INC = ('../lib', 'lib');
    }
    else {
        unshift @INC, 't/lib';
    }
}

use strict;
use Test::More tests => 11;

my $a1 = [ 1, 2, 3 ];
push @$a1, $a1;
my $a2 = [ 1, 2, 3 ];
push @$a2, $a2;

is_deeply $a1, $a2;
ok( eq_array ($a1, $a2) );
ok( eq_set   ($a1, $a2) );

my $h1 = { 1=>1, 2=>2, 3=>3 };
$h1->{4} = $h1;
my $h2 = { 1=>1, 2=>2, 3=>3 };
$h2->{4} = $h2;

is_deeply $h1, $h2;
ok( eq_hash  ($h1, $h2) );

my ($r, $s);

$r = \$r;
$s = \$s;

ok( eq_array ([$s], [$r]) );


{
    # Classic set of circular scalar refs.
    my($a,$b,$c);
    $a = \$b;
    $b = \$c;
    $c = \$a;

    my($d,$e,$f);
    $d = \$e;
    $e = \$f;
    $f = \$d;

    is_deeply( $a, $a );
    is_deeply( $a, $d );
}


{
    # rt.cpan.org 11623
    # Make sure the circular ref checks don't get confused by a reference 
    # which is simply repeating.
    my $a = {};
    my $b = {};
    my $c = {};

    is_deeply( [$a, $a], [$b, $c] );
    is_deeply( { foo => $a, bar => $a }, { foo => $b, bar => $c } );
    is_deeply( [\$a, \$a], [\$b, \$c] );
}

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