--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/Wimplicit-fallthrough-14.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,162 @@
+/* PR c/7652 */
+/* { dg-do compile } */
+/* { dg-options "-Wimplicit-fallthrough" } */
+
+/* Test various falls through comments.  */
+
+extern void bar (int);
+
+void
+fn (int i)
+{
+  switch (i)
+    {
+    case -1:
+      bar (-1);
+      /*-fallthrough*/
+    case 0:
+      bar (0);
+      /*@fallthrough@*/
+    case 1:
+      bar (1);
+      /* FALL THRU */
+    case 2:
+       bar (2);
+      /* FALLTHRU */
+    case 3:
+      bar (3);
+      /* FALLS THRU */
+    case 4:
+      bar (4);
+      /* FALL-THRU */
+    case 5:
+      bar (5);
+      /* FALL THROUGH */
+    case 6:
+       bar (6);
+      /* FALLTHROUGH */
+    case 7:
+      bar (7);
+      /* FALLS THROUGH */
+    case 8:
+      bar (8);
+      /* FALL-THROUGH */
+    case 9:
+      bar (9);
+      /*FALLTHRU*/
+    case 10:
+      bar (10);
+      /* FALLTHRU.*/
+    case 11:
+       bar (11);
+      /* FALLTHROUGH.  */
+    case 12:
+       bar (12);
+      /* Fall thru */
+    case 13:
+       bar (13);
+      /* Falls thru */
+    case 14:
+       bar (14);
+      /* Fall-thru */
+    case 15:
+       bar (15);
+      /* Fall Thru */
+    case 16:
+       bar (16);
+      /* Falls Thru */
+    case 17:
+       bar (17);
+      /* Fall-Thru */
+    case 18:
+       bar (18);
+      /* Fall through */
+    case 19:
+       bar (19);
+      /* Falls through */
+    case 20:
+       bar (20);
+      /* Fall-through */
+    case 21:
+       bar (21);
+      /* Fall Through */
+    case 22:
+       bar (22);
+      /* Falls Through */
+    case 23:
+       bar (23);
+      /* Fall-Through */
+    case 24:
+       bar (24);
+      /* Falls through.  */
+    case 25:
+       bar (25);
+      /*     Falls through.  */
+    case 26:
+       bar (26);
+      /* fall thru */
+    case 27:
+       bar (27);
+      /* falls thru */
+    case 28:
+       bar (28);
+      /* fall-thru */
+    case 29:
+       bar (29);
+      /* fall thru */
+    case 30:
+       bar (30);
+      /* falls thru */
+    case 31:
+       bar (31);
+      /* fall-thru */
+    case 32:
+       bar (32);
+      /* fall through */
+    case 33:
+       bar (33);
+      /* falls through */
+    case 34:
+       bar (34);
+      /* fall-through */
+    default:
+      bar (99);
+    }
+
+  switch (i)
+    {
+    case 0:
+      i++;
+      /*@fallthrough@*/
+L:
+    default:
+      bar (6);
+    }
+
+  {
+    __label__ L2;
+    switch (i)
+      {
+      case 0:
+	i++;
+	/*@fallthrough@*/
+L2:
+      default:
+      bar (6);
+      }
+  }
+
+  /* Don't generate false -Wswitch-unreachable warning.  */
+  switch (i)
+    {
+      /*FALLTHROUGH*/
+      case 0:
+        i++;
+    }
+
+  if (i)
+  {
+    /* fall through */
+  L1:;
+  }
+}