clang/test/SemaCXX/microsoft-new-array-fallback.cpp

// RUN: %clang_cc1 -fms-compatibility -fsyntax-only -verify -std=c++11 %s

typedef __SIZE_TYPE__ size_t;

void *operator new[](size_t); // #new_array_decl
void *operator new(size_t); // #new_decl

struct Tag {};

void f() {
  int *p = new (Tag{}) int[4]; // #new_expr
  // expected-error@#new_expr {{no matching function for call to 'operator new[]'}}
  // expected-note@#new_array_decl {{candidate function not viable: requires 1 argument, but 2 were provided}}
  // expected-note@#new_expr {{Microsoft compatibility array allocation fallback to '::operator new(size_t)' failed}}
  (void)p;
}