warnings.t

来自「source of perl for linux application,」· T 代码 · 共 33 行

#!/usr/bin/perl -w

BEGIN {
   if( $ENV{PERL_CORE} ) {
        chdir 't' if -d 't';
        @INC = qw(../lib);
    }
}

use strict;

use Test::More tests => 1;

my $warnings;
BEGIN {
    $SIG{__WARN__} = sub { $warnings = join '', @_ };
}

{
    package Foo;
    use fields qw(thing);
}

{
    package Bar;
    use fields qw(stuff);
    use base qw(Foo);
}

::like $warnings,
       '/^Bar is inheriting from Foo but already has its own fields!/',
       'Inheriting from a base with protected fields warns';