1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
#!./perl
BEGIN {
chdir 't' if -d 't';
@INC = '../lib';
require './test.pl';
}
use strict;
use vars qw(@ary %ary %hash);
plan 40;
ok !defined($a);
$a = 1+1;
ok defined($a);
undef $a;
ok !defined($a);
$a = "hi";
ok defined($a);
$a = $b;
ok !defined($a);
@ary = ("1arg");
$a = pop(@ary);
ok defined($a);
$a = pop(@ary);
ok !defined($a);
@ary = ("1arg");
$a = shift(@ary);
ok defined($a);
$a = shift(@ary);
ok !defined($a);
$ary{'foo'} = 'hi';
ok defined($ary{'foo'});
ok !defined($ary{'bar'});
undef $ary{'foo'};
ok !defined($ary{'foo'});
ok defined(@ary);
{
no warnings 'deprecated';
ok defined(%ary);
}
ok %ary;
undef @ary;
ok !defined(@ary);
undef %ary;
{
no warnings 'deprecated';
ok !defined(%ary);
}
ok !%ary;
@ary = (1);
ok defined @ary;
%ary = (1,1);
{
no warnings 'deprecated';
ok defined %ary;
}
ok %ary;
sub foo { pass; 1 }
&foo || fail;
ok defined &foo;
undef &foo;
ok !defined(&foo);
eval { undef $1 };
like $@, qr/^Modification of a read/;
eval { $1 = undef };
like $@, qr/^Modification of a read/;
{
require Tie::Hash;
tie my %foo, 'Tie::StdHash';
no warnings 'deprecated';
ok defined %foo;
%foo = ( a => 1 );
ok defined %foo;
}
{
require Tie::Array;
tie my @foo, 'Tie::StdArray';
no warnings 'deprecated';
ok defined @foo;
@foo = ( a => 1 );
ok defined @foo;
}
{
# [perl #17753] segfault when undef'ing unquoted string constant
eval 'undef tcp';
like $@, qr/^Can't modify constant item/;
}
# bugid 3096
# undefing a hash may free objects with destructors that then try to
# modify the hash. To them, the hash should appear empty.
%hash = (
key1 => bless({}, 'X'),
key2 => bless({}, 'X'),
);
undef %hash;
sub X::DESTROY {
is scalar keys %hash, 0;
is scalar values %hash, 0;
my @l = each %hash;
is @l, 0;
is delete $hash{'key2'}, undef;
}
# this will segfault if it fails
sub PVBM () { 'foo' }
{ my $dummy = index 'foo', PVBM }
my $pvbm = PVBM;
undef $pvbm;
ok !defined $pvbm;
|
