1 files changed, 33 insertions, 0 deletions
diff --git a/clang/test/SemaCXX/derived-to-base-ambig.cpp b/clang/test/SemaCXX/derived-to-base-ambig.cpp
new file mode 100644
index 0000000..129ec79
--- /dev/null
+++ b/clang/test/SemaCXX/derived-to-base-ambig.cpp
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+class A { };
+class B : public A { };
+class C : public A { };
+class D : public B, public C { };
+
+void f(D* d) {
+  A* a;
+  a = d; // expected-error{{ambiguous conversion from derived class 'D' to base class 'A':}} expected-error{{assigning to 'A *' from incompatible type 'D *'}}
+}
+
+class Object2 { };
+class A2 : public Object2 { };
+class B2 : public virtual A2 { };
+class C2 : virtual public A2 { };
+class D2 : public B2, public C2 { };
+class E2 : public D2, public C2, public virtual A2 { };
+class F2 : public E2, public A2 { };
+
+void g(E2* e2, F2* f2) {
+  Object2* o2;
+  o2 = e2;
+  o2 = f2; // expected-error{{ambiguous conversion from derived class 'F2' to base class 'Object2':}} expected-error{{assigning to 'Object2 *' from incompatible type 'F2 *'}}
+}
+
+// Test that ambiguous/inaccessibility checking does not trigger too
+// early, because it should not apply during overload resolution.
+void overload_okay(Object2*);
+void overload_okay(E2*);
+
+void overload_call(F2* f2) {
+  overload_okay(f2);
+}