1 files changed, 100 insertions, 0 deletions
diff --git a/contrib/perl5/t/op/concat.t b/contrib/perl5/t/op/concat.t
new file mode 100755
index 000000000000..76074e0f28f1
--- /dev/null
+++ b/contrib/perl5/t/op/concat.t
@@ -0,0 +1,100 @@
+#!./perl
+
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+}
+
+print "1..11\n";
+
+($a, $b, $c) = qw(foo bar);
+
+print "not " unless "$a" eq "foo";
+print "ok 1\n";
+
+print "not " unless "$a$b" eq "foobar";
+print "ok 2\n";
+
+print "not " unless "$c$a$c" eq "foo";
+print "ok 3\n";
+
+# Okay, so that wasn't very challenging.  Let's go Unicode.
+
+my $test = 4;
+
+{
+    # bug id 20000819.004 
+
+    $_ = $dx = "\x{10f2}";
+    s/($dx)/$dx$1/;
+    {
+	use bytes;
+	print "not " unless $_ eq "$dx$dx";
+	print "ok $test\n";
+	$test++;
+    }
+
+    $_ = $dx = "\x{10f2}";
+    s/($dx)/$1$dx/;
+    {
+	use bytes;
+	print "not " unless $_ eq "$dx$dx";
+	print "ok $test\n";
+	$test++;
+    }
+
+    $dx = "\x{10f2}";
+    $_  = "\x{10f2}\x{10f2}";
+    s/($dx)($dx)/$1$2/;
+    {
+	use bytes;
+	print "not " unless $_ eq "$dx$dx";
+	print "ok $test\n";
+	$test++;
+    }
+}
+
+{
+    # bug id 20000901.092
+    # test that undef left and right of utf8 results in a valid string
+
+    my $a;
+    $a .= "\x{1ff}";
+    print "not " unless $a eq "\x{1ff}";
+    print "ok $test\n";
+    $test++;
+}
+
+{
+    # ID 20001020.006
+
+    "x" =~ /(.)/; # unset $2
+
+    # Without the fix this 5.7.0 would croak:
+    # Modification of a read-only value attempted at ...
+    "$2\x{1234}";
+
+    print "ok $test\n";
+    $test++;
+
+    # For symmetry with the above.
+    "\x{1234}$2";
+
+    print "ok $test\n";
+    $test++;
+
+    *pi = \undef;
+    # This bug existed earlier than the $2 bug, but is fixed with the same
+    # patch. Without the fix this 5.7.0 would also croak:
+    # Modification of a read-only value attempted at ...
+    "$pi\x{1234}";
+
+    print "ok $test\n";
+    $test++;
+
+    # For symmetry with the above.
+    "\x{1234}$pi";
+
+    print "ok $test\n";
+    $test++;
+}