--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/Wimplicit-fallthrough-36.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,72 @@
+/* PR c/79153 */
+/* { dg-do compile } */
+/* { dg-options "-Wimplicit-fallthrough" } */
+
+int
+test (int v1, int v2)
+{
+  switch (v1)
+    {
+    case 3:
+      switch (v2)	/* { dg-warning "this statement may fall through" } */
+	{
+	case 1:
+	  return 28;
+	case 2:
+	  return 38;
+	case 3:
+	  return 88;
+	default:
+	  break;
+	}
+    case 4:		/* { dg-message "here" } */
+      return 168;
+    case 5:
+      switch (v2)	/* { dg-warning "this statement may fall through" } */
+	{
+	case 4:
+	  break;
+	case 5:
+	  return 38;
+	case 6:
+	  return 88;
+	}
+    case 6:		/* { dg-message "here" } */
+      return 169;
+    case 7:
+      switch (v2)	/* { dg-warning "this statement may fall through" } */
+	{
+	case 7:
+	  return 38;
+	case 8:
+	  return 88;
+	}
+    case 8:		/* { dg-message "here" } */
+      return 170;
+    case 9:
+      switch (v2)	/* { dg-bogus "this statement may fall through" } */
+	{
+	case 9:
+	  return 38;
+	case 10:
+	  return 88;
+	default:
+	  return 89;
+	}
+    case 10:
+      return 171;
+    case 11:
+      switch (v2)	/* { dg-bogus "this statement may fall through" } */
+	{
+	case -__INT_MAX__ - 1 ... 31:
+	  return 38;
+	case 32:
+	  return 88;
+	case 33 ... __INT_MAX__:
+	  return 89;
+	}
+    case 12:
+      return 172;
+    }
+  return -1;
+}