#!./perl
-# $RCSfile: undef.t,v $$Revision: 4.1 $$Date: 92/08/07 18:28:34 $
-
-print "1..21\n";
+print "1..27\n";
print defined($a) ? "not ok 1\n" : "ok 1\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";
+
+{
+ require Tie::Hash;
+ tie my %foo, 'Tie::StdHash';
+ print defined %foo ? "ok 24\n" : "not ok 24\n";
+ %foo = ( a => 1 );
+ print defined %foo ? "ok 25\n" : "not ok 25\n";
+}
+
+{
+ require Tie::Array;
+ tie my @foo, 'Tie::StdArray';
+ print defined @foo ? "ok 26\n" : "not ok 26\n";
+ @foo = ( a => 1 );
+ print defined @foo ? "ok 27\n" : "not ok 27\n";
+}