--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/warn/Wplacement-new-size-4.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,14 @@
+// PR c++/77804 - Internal compiler error on incorrect initialization of
+// new-d array
+// { dg-do compile }
+// { dg-additional-options "-Wplacement-new -Wvla -Wno-error=vla" }
+
+void* operator new[] (__SIZE_TYPE__ n, void *p) { return p; }
+
+int main()
+{
+    char buf[256];
+    unsigned n = 10;
+    int* p = new (buf) (int[n]);  // { dg-warning "non-constant array new length must be specified without parentheses around the type-id" }
+    //  { dg-warning "ISO C\\+\\+ forbids variable length array" "vla warning" { target *-*-* } .-1 }
+}