--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/utf16-3.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,49 @@
+/* Contributed by Kris Van Hees <kris.van.hees@oracle.com> */
+/* Test concatenation of char16_t* string literals. */
+/* { dg-do run } */
+/* { dg-options "-std=gnu99 -Wall -Werror" } */
+
+typedef __CHAR16_TYPE__ char16_t;
+
+extern void abort (void);
+
+char16_t	*s0 = u"a" u"b";
+
+char16_t	*s1 = u"a" "b";
+char16_t	*s2 = "a" u"b";
+char16_t	*s3 = u"a" "\u2029";
+char16_t	*s4 = "\u2029" u"b";
+char16_t	*s5 = u"a" "\U00064321";
+char16_t	*s6 = "\U00064321" u"b";
+
+#define A	0x0061
+#define B	0x0062
+#define X	0x2029
+#define Y1	0xD950
+#define Y2	0xDF21
+
+int main ()
+{
+    if (sizeof ((u"a" u"b")[0]) != sizeof (char16_t))
+	abort ();
+    if (sizeof ((u"a"  "b")[0]) != sizeof (char16_t))
+	abort ();
+    if (sizeof (( "a" u"b")[0]) != sizeof (char16_t))
+	abort ();
+
+    if (s0[0] != A || s0[1] != B || s0[2] != 0x0000)
+	abort ();
+
+    if (s1[0] != A || s1[1] != B || s1[2] != 0x0000)
+	abort ();
+    if (s2[0] != A || s2[1] != B || s2[2] != 0x0000)
+	abort ();
+    if (s3[0] != A || s3[1] != X || s3[2] != 0x0000)
+	abort ();
+    if (s4[0] != X || s4[1] != B || s4[2] != 0x0000)
+	abort ();
+    if (s5[0] != A || s5[1] != Y1 || s5[2] != Y2 || s5[3] != 0x0000)
+	abort ();
+    if (s6[0] != Y1 || s6[1] != Y2 || s6[2] != B || s6[3] != 0x0000)
+	abort ();
+}