--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/warn/Warray-bounds-4.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,37 @@
+// { dg-do compile }
+// { dg-options "-O2 -Warray-bounds" }
+
+class String
+{
+public:
+  virtual unsigned long length() const = 0;
+  virtual char get(unsigned long index) const = 0;
+  virtual void set(unsigned long index, char value) = 0;
+  virtual char& operator[] (unsigned long value) = 0;
+  virtual ~String() {};
+};
+
+template<unsigned long size> class FixedString : public String
+{
+private:
+  char contents[size];
+
+public:
+  virtual unsigned long length() const { return size; }
+  virtual char get(unsigned long index) const { return contents[index]; }
+  virtual void set(unsigned long index, char value) { contents[index] = value; }
+  virtual char& operator[] (unsigned long index) { return contents[index]; }
+
+  FixedString() { contents[0] = '\0'; } // { dg-warning "above array bounds" }
+};
+
+void print_length (const String& string);
+
+int main()
+{
+  const FixedString<0> empty;
+
+  print_length(empty);
+
+  return 0;
+}