--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/warn/pr83054.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,41 @@
+// PR ipa/83054
+// { dg-options "-O3 -Wsuggest-final-types" }
+// { dg-do compile }
+
+extern "C" int printf (const char *, ...);
+struct foo // { dg-warning "final would enable devirtualization of 5 calls" }
+{
+  static int count;
+  void print (int i, int j) { printf ("foo[%d][%d] = %d\n", i, j, x); }
+  int x;
+  foo () {
+    x = count++;
+    printf("this %d = %x\n", x, (void *)this);
+  }
+  virtual ~foo () {
+    printf("this %d = %x\n", x, (void *)this);
+    --count;
+  }
+};
+int foo::count;
+
+
+int main ()
+{
+  {
+    foo array[3][3];
+    for (int i = 0; i < 3; i++)
+      {
+	for (int j = 0; j < 3; j++)
+	  {
+	    printf("&a[%d][%d] = %x\n", i, j, (void *)&array[i][j]);
+	  }
+      }
+      // The count should be nine, if not, fail the test.
+      if (foo::count != 9)
+	return 1;
+  }
+  if (foo::count != 0)
+    return 1;
+  return 0;
+}