1 files changed, 67 insertions, 0 deletions
diff --git a/clang/test/SemaCXX/ambig-user-defined-conversions.cpp b/clang/test/SemaCXX/ambig-user-defined-conversions.cpp
new file mode 100644
index 0000000..1a3c102
--- /dev/null
+++ b/clang/test/SemaCXX/ambig-user-defined-conversions.cpp
@@ -0,0 +1,67 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+namespace test0 {
+  struct BASE { 
+    operator int &(); // expected-note {{candidate function}}
+  }; 
+  struct BASE1 { 
+    operator int &(); // expected-note {{candidate function}}
+  }; 
+
+  struct B : public BASE, BASE1 {};
+
+  extern B f(); 
+  B b1;
+
+  void func(const int ci, const char cc); // expected-note {{candidate function}}
+  void func(const char ci, const B b); // expected-note {{candidate function}}
+  void func(const B b, const int ci); // expected-note {{candidate function}}
+
+  const int Test1() {
+
+    func(b1, f()); // expected-error {{call to 'func' is ambiguous}}
+    return f(); // expected-error {{conversion from 'test0::B' to 'const int' is ambiguous}}
+  }
+
+  // This used to crash when comparing the two operands.
+  void func2(const char cc); // expected-note {{candidate function}}
+  void func2(const int ci); // expected-note {{candidate function}}
+  void Test2() {
+    func2(b1); // expected-error {{call to 'func2' is ambiguous}}
+  }
+}
+
+namespace test1 {
+  struct E;
+  struct A { 
+    A (E&); 
+  };
+
+  struct E { 
+    operator A (); 
+  };
+
+  struct C { 
+    C (E&);  
+  };
+
+  void f1(A);	// expected-note {{candidate function}}
+  void f1(C);	// expected-note {{candidate function}}
+
+  void Test2()
+  {
+    E b;
+    f1(b);  // expected-error {{call to 'f1' is ambiguous}}	
+            // ambiguous because b -> C via constructor and
+            // b -> A via constructor or conversion function.
+  }
+}
+
+namespace rdar8876150 {
+  struct A { operator bool(); };
+  struct B : A { };
+  struct C : A { };
+  struct D : B, C { };
+
+  bool f(D d) { return !d; } // expected-error{{ambiguous conversion from derived class 'rdar8876150::D' to base class 'rdar8876150::A':}}
+}