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-MRO-Compat/t/20mros.t
use strict;
use warnings;

use Test::More tests => 13;

use MRO::Compat;

{
    package AAA; our @ISA = qw//; use mro 'dfs';
    package BBB; our @ISA = qw/AAA/; use mro 'dfs';
    package CCC; our @ISA = qw/AAA/; use mro 'dfs';
    package DDD; our @ISA = qw/AAA/; use mro 'dfs';
    package EEE; our @ISA = qw/BBB CCC DDD/; use mro 'dfs';
    package FFF; our @ISA = qw/EEE DDD/; use mro 'dfs';
    package GGG; our @ISA = qw/FFF/; use mro 'dfs';

    package AAA3; our @ISA = qw//;
    sub testsub { return $_[0] . '_first_in_dfs' }
    package BBB3; our @ISA = qw/AAA3/;
    package CCC3; our @ISA = qw/AAA3/;
    sub testsub { return $_[0] . '_first_in_c3' }
    package DDD3; our @ISA = qw/AAA3/;
    package EEE3; our @ISA = qw/BBB3 CCC3 DDD3/;
    package FFF3; our @ISA = qw/EEE3 DDD3/; use mro 'c3';
    package GGG3; our @ISA = qw/FFF3/; use mro 'c3';
}

is(mro::get_mro('FFF3'), 'c3');

is_deeply(
  mro::get_linear_isa('GGG'),
  [ 'GGG', 'FFF', 'EEE', 'BBB', 'AAA', 'CCC', 'DDD' ],
  "get_linear_isa for GGG",
);

is_deeply(
  mro::get_linear_isa('GGG3'),
  [ 'GGG3', 'FFF3', 'EEE3', 'BBB3', 'CCC3', 'DDD3', 'AAA3' ],
  "get_linear_isa for GGG3",
);

SKIP: {
    skip "Does not work like this on 5.9.5+", 1 if $] > 5.009_004;
    is(FFF3->testsub(), 'FFF3_first_in_dfs', 'dfs resolution pre-init');
}

Class::C3::initialize();

is(FFF3->testsub(), 'FFF3_first_in_c3', 'c3 resolution post-init');

mro::set_mro('FFF3', 'dfs');
is(mro::get_mro('FFF3'), 'dfs');
is_deeply(
  mro::get_linear_isa('FFF3'),
  [ 'FFF3', 'EEE3', 'BBB3', 'AAA3', 'CCC3', 'DDD3' ],
  "get_linear_isa for FFF3 (dfs)",
);

is(FFF3->testsub(), 'FFF3_first_in_dfs', 'dfs resolution post- set_mro dfs');

is_deeply(
  mro::get_linear_isa('GGG3'),
  [ 'GGG3', 'FFF3', 'EEE3', 'BBB3', 'CCC3', 'DDD3', 'AAA3' ],
  "get_linear_isa for GGG3 (still c3)",
);

mro::set_mro('FFF3', 'c3');
is(mro::get_mro('FFF3'), 'c3');
is_deeply(
  mro::get_linear_isa('FFF3'),
  [ 'FFF3', 'EEE3', 'BBB3', 'CCC3', 'DDD3', 'AAA3' ],
  "get_linear_isa for FFF3 (reset to c3 via set_mro)",
);

eval "package FFF3; use mro 'dfs'";
is(mro::get_mro('FFF3'), 'dfs');
is_deeply(
  mro::get_linear_isa('FFF3'),
  [ 'FFF3', 'EEE3', 'BBB3', 'AAA3', 'CCC3', 'DDD3' ],
  "get_linear_isa for FFF3 (reset to dfs via 'use mro')",
);

haha - 2025