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#!./perl
print "1..23\n";
print defined($a) ? "not ok 1\n" : "ok 1\n";
$a = 1+1;
print defined($a) ? "ok 2\n" : "not ok 2\n";
undef $a;
print defined($a) ? "not ok 3\n" : "ok 3\n";
$a = "hi";
print defined($a) ? "ok 4\n" : "not ok 4\n";
$a = $b;
print defined($a) ? "not ok 5\n" : "ok 5\n";
@ary = ("1arg");
$a = pop(@ary);
print defined($a) ? "ok 6\n" : "not ok 6\n";
$a = pop(@ary);
print defined($a) ? "not ok 7\n" : "ok 7\n";
@ary = ("1arg");
$a = shift(@ary);
print defined($a) ? "ok 8\n" : "not ok 8\n";
$a = shift(@ary);
print defined($a) ? "not ok 9\n" : "ok 9\n";
$ary{'foo'} = 'hi';
print defined($ary{'foo'}) ? "ok 10\n" : "not ok 10\n";
print defined($ary{'bar'}) ? "not ok 11\n" : "ok 11\n";
undef $ary{'foo'};
print defined($ary{'foo'}) ? "not ok 12\n" : "ok 12\n";
print defined(@ary) ? "ok 13\n" : "not ok 13\n";
print defined(%ary) ? "ok 14\n" : "not ok 14\n";
undef @ary;
print defined(@ary) ? "not ok 15\n" : "ok 15\n";
undef %ary;
print defined(%ary) ? "not ok 16\n" : "ok 16\n";
@ary = (1);
print defined @ary ? "ok 17\n" : "not ok 17\n";
%ary = (1,1);
print defined %ary ? "ok 18\n" : "not ok 18\n";
sub foo { print "ok 19\n"; }
&foo || print "not ok 19\n";
print defined &foo ? "ok 20\n" : "not ok 20\n";
undef &foo;
print defined(&foo) ? "not ok 21\n" : "ok 21\n";
eval { undef $1 };
print $@ =~ /^Modification of a read/ ? "ok 22\n" : "not ok 22\n";
eval { $1 = undef };
print $@ =~ /^Modification of a read/ ? "ok 23\n" : "not ok 23\n";
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