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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 : //proc/thread-self/root/usr/share/doc/perl-Sub-Exporter/t/util-currychain.t

#!/usr/bin/perl -T
use strict;
use warnings;

use Test::More tests => 4;

BEGIN { use_ok("Sub::Exporter::Util", qw(curry_chain)); }

# So, some packages that we'll chain methods through.
{
  package Test::CurryChain::Head;
  sub new          { my ($class, @arg) = @_; bless [ @arg ] => $class; }
  sub next_obj     { shift; return Test::CurryChain::Tail->new(@_); }
  sub false        { return; }
  sub non_invocant { return 1; }

  package Test::CurryChain::Tail;
  sub new      { my ($class, @arg) = @_; bless [ @arg ] => $class; }
  sub rev_guts { return reverse @{shift()}; }
}

{
  # Then the generator which could be put into a Sub::Exporter -setup.
  # This is an optlist.  AREF = args; undef = no args; CODE = args generator
  my $generator = curry_chain(
    next_obj => [ 1, 2, 3 ],
    rev_guts => undef,
  );

  my $curried_sub = $generator->('Test::CurryChain::Head');
  my @result = $curried_sub->();
  is_deeply(
    \@result,
    [ 3, 2, 1],
    "simple curried chain behaves as expected"
  );
}

{
  # This one will fail, beacuse the second call returns false.
  my $generator = curry_chain(
    new       => [ 1, 2, 3 ],
    false     => undef,
    will_fail => undef,
  );

  my $curried_sub = $generator->('Test::CurryChain::Head');

  eval { $curried_sub->() };

  like($@, qr/can't call will_fail/, "exception on broken chain");
}

{
  # This one will fail, beacuse the second call returns a true non-invocant.
  my $generator = curry_chain(
    new          => [ 1, 2, 3 ],
    non_invocant => undef,
    will_fail    => undef,
  );

  my $curried_sub = $generator->('Test::CurryChain::Head');

  eval { $curried_sub->() };

  like($@, qr/can't call will_fail/, "exception on broken chain");
}

haha - 2025