1 files changed, 28 insertions, 1 deletions
diff --git a/clang/test/SemaCXX/abstract.cpp b/clang/test/SemaCXX/abstract.cpp
index 1c5b715775d..d7e2d0a3dcf 100644
--- a/clang/test/SemaCXX/abstract.cpp
+++ b/clang/test/SemaCXX/abstract.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11
+// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11 -Wabstract-vbase-init
 
 #ifndef __GXX_EXPERIMENTAL_CXX0X__
 #define __CONCAT(__X, __Y) __CONCAT1(__X, __Y)
@@ -280,3 +280,30 @@ namespace pr12658 {
     foo(C(99)); // expected-error {{allocating an object of abstract class type 'pr12658::C'}}
   }
 }
+
+namespace pr16659 {
+  struct A {
+    A(int);
+    virtual void x() = 0; // expected-note {{unimplemented pure virtual method 'x' in 'RedundantInit'}}
+  };
+  struct B : virtual A {};
+  struct C : B {
+    C() : A(37) {}
+    void x() override {}
+  };
+
+  struct X {
+    friend class Z;
+  private:
+    X &operator=(const X&);
+  };
+  struct Y : virtual X { // expected-note {{::X' has an inaccessible copy assignment}}
+    virtual ~Y() = 0;
+  };
+  struct Z : Y {}; // expected-note {{::Y' has a deleted copy assignment}}
+  void f(Z &a, const Z &b) { a = b; } // expected-error {{copy assignment operator is implicitly deleted}}
+
+  struct RedundantInit : virtual A {
+    RedundantInit() : A(0) {} // expected-warning {{initializer for virtual base class 'pr16659::A' of abstract class 'RedundantInit' will never be used}}
+  };
+}