use DateTime::TimeZone::Local;
use Test::More tests => 1;

my @input = (1 .. 10 );
my (@output) = sort {
    DateTime::TimeZone::Local->TimeZone();
    $a cmp $b
} @input;

is_deeply(\@output, \@input);

输出量：

1..1
Can't return outside a subroutine at /usr/local/share/perl/5.8.8/DateTime/TimeZone/Local.pm line 72.
# Looks like your test exited with 9 before it could output anything.

shell returned 9

我已经检查过了，它肯定在一个子例程里面。它看起来和所使用的模块没有任何关系，这段代码也会导致同样的错误：

my @output = sort {
    sub1();
} (1 .. 5);

sub sub1 {
    eval "use ModuleDoesntExist";
    return 1; # remove this and get a seg fault
}

看起来这是perl中的一个bug。有什么想法吗？更感兴趣的是为什么会发生这种情况，而不是解决方法-它只会在模块不存在的情况下发生。