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　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。 . Prv8 Shell

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Current File : //usr/share/doc/perl-Test-Simple/t/Legacy/is_deeply_dne_bug.t

#!/usr/bin/perl -w

# test for rt.cpan.org 20768
#
# There was a bug where the internal "does not exist" object could get
# confused with an overloaded object.

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

use strict;
use Test::More tests => 2;

{
    package Foo;

    use overload
    'eq' => \&overload_equiv,
    '==' => \&overload_equiv;

    sub new {
        return bless {}, shift;
    }

    sub overload_equiv {
        if (ref($_[0]) ne 'Foo' || ref($_[1]) ne 'Foo') {
            print ref($_[0]), " ", ref($_[1]), "\n";
            die "Invalid object passed to overload_equiv\n";
        }

        return 1; # change to 0 ... makes little difference
    }
}

my $obj1 = Foo->new();
my $obj2 = Foo->new();

eval { is_deeply([$obj1, $obj2], [$obj1, $obj2]); };
is $@, '';

haha - 2025