Index: lib/Sema/SemaDeclCXX.cpp
===================================================================
--- lib/Sema/SemaDeclCXX.cpp	(revision 172546)
+++ lib/Sema/SemaDeclCXX.cpp	(working copy)
@@ -10815,7 +10815,7 @@
 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
   AdjustDeclIfTemplate(Dcl);
 
-  FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl);
+  FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl);
   if (!Fn) {
     Diag(DelLoc, diag::err_deleted_non_function);
     return;
@@ -10835,7 +10835,7 @@
 }
 
 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
-  CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl);
+  CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl);
 
   if (MD) {
     if (MD->getParent()->isDependentType()) {
Index: test/SemaCXX/cxx0x-defaulted-functions.cpp
===================================================================
--- test/SemaCXX/cxx0x-defaulted-functions.cpp	(revision 172546)
+++ test/SemaCXX/cxx0x-defaulted-functions.cpp	(working copy)
@@ -149,3 +149,24 @@
   Y &Y::operator=(Y&&) = default; // expected-error {{definition of explicitly defaulted}}
   Y::~Y() = default; // expected-error {{definition of explicitly defaulted}}
 }
+
+namespace PR14577 {
+  template<typename T>
+  struct Outer {
+    template<typename U>
+    struct Inner1 {
+      ~Inner1();
+    };
+
+    template<typename U>
+    struct Inner2 {
+      ~Inner2();
+    };
+  };
+
+  template<typename T>
+  Outer<T>::Inner1<T>::~Inner1() = delete; // expected-error {{nested name specifier 'Outer<T>::Inner1<T>::' for declaration does not refer into a class, class template or class template partial specialization}}  expected-error {{only functions can have deleted definitions}}
+
+  template<typename T>
+  Outer<T>::Inner2<T>::~Inner2() = default; // expected-error {{nested name specifier 'Outer<T>::Inner2<T>::' for declaration does not refer into a class, class template or class template partial specialization}}  expected-error {{only special member functions may be defaulted}}
+}