require 'test.pl';
-plan (6);
+plan (9);
my $blank = "";
eval {select undef, $blank, $blank, 0};
is ($@, "");
eval {select "", $blank, $blank, 0};
-like ($@, qr/^Modification of a read-only value attempted/);
+is ($@, "");
eval {select $blank, "", $blank, 0};
-like ($@, qr/^Modification of a read-only value attempted/);
+is ($@, "");
eval {select $blank, $blank, "", 0};
+is ($@, "");
+
+eval {select "a", $blank, $blank, 0};
+like ($@, qr/^Modification of a read-only value attempted/);
+eval {select $blank, "a", $blank, 0};
+like ($@, qr/^Modification of a read-only value attempted/);
+eval {select $blank, $blank, "a", 0};
like ($@, qr/^Modification of a read-only value attempted/);