1 files changed, 80 insertions, 0 deletions

diff --git a/test/CXX/class.derived/class.abstract/p4.cpp b/test/CXX/class.derived/class.abstract/p4.cpp
new file mode 100644
index 000000000000..ca99bf7f1658
--- /dev/null
+++ b/test/CXX/class.derived/class.abstract/p4.cpp
@@ -0,0 +1,80 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+namespace PR6631 {
+  struct A { 
+    virtual void f() = 0;
+  };
+
+  struct B : virtual A { };
+
+  struct C : virtual A { 
+    virtual void f();
+  };
+
+  struct D : public B, public C { 
+    virtual void f();
+  };
+
+  void f() {
+    (void)new D; // okay
+  }
+}
+
+// Check cases where we have a virtual function that is pure in one
+// subobject but not pure in another subobject.
+namespace PartlyPure {
+  struct A { 
+    virtual void f() = 0; // expected-note{{pure virtual function}}
+  };
+
+  struct B : A {
+    virtual void f();
+  };
+
+  struct C : virtual A { };
+
+  struct D : B, C { };
+
+  void f() {
+    (void) new D; // expected-error{{abstract type}}
+  }
+}
+
+namespace NonPureAlongOnePath {
+  struct A { 
+    virtual void f() = 0;
+  };
+
+  struct B : virtual A {
+    virtual void f();
+  };
+
+  struct C : virtual A { };
+
+  struct D : B, C { };
+
+  void f() {
+    (void) new D; // okay
+  }  
+}
+
+namespace NonPureAlongOnePath2 {
+  struct Aprime { 
+    virtual void f() = 0;
+  };
+
+  struct A : Aprime {
+  };
+
+  struct B : virtual A {
+    virtual void f();
+  };
+
+  struct C : virtual A { };
+
+  struct D : B, C { };
+
+  void f() {
+    (void) new D; // okay
+  }  
+}