Add a forgotten place where the enclosing namespace set matters, plus a big testcase for inline namespace fun.

llvm-svn: 112565

clang/lib/Sema/SemaTemplate.cpp

@@ -3440,8 +3440,8 @@ static bool CheckTemplateSpecializationScope(Sema &S,
        getTemplateSpecializationKind(PrevDecl) == TSK_ImplicitInstantiation)){
     // There is no prior declaration of this entity, so this
     // specialization must be in the same context as the template
-    // itself.
-    if (!DC->Equals(SpecializedContext)) {
+    // itself, or in the enclosing namespace set.
+    if (!DC->InEnclosingNamespaceSetOf(SpecializedContext)) {
       if (isa<TranslationUnitDecl>(SpecializedContext))
         S.Diag(Loc, diag::err_template_spec_decl_out_of_scope_global)
         << EntityKind << Specialized;

clang/test/CXX/dcl.dcl/basic.namespace/namespace.def/p8.cpp

@@ -0,0 +1,74 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++0x %s
+
+// Fun things you can do with inline namespaces:
+
+inline namespace X {
+  void f1();
+
+  inline namespace Y {
+    void f2();
+
+    template <typename T> class C {};
+  }
+
+  // Specialize and partially specialize somewhere else.
+  template <> class C<int> {};
+  template <typename T> class C<T*> {};
+}
+
+// Qualified and unqualified lookup as if member of enclosing NS.
+void foo1() {
+  f1();
+  ::f1();
+  X::f1();
+  Y::f1(); // expected-error {{no member named 'f1' in namespace 'X::Y'}}
+
+  f2();
+  ::f2();
+  X::f2();
+  Y::f2();
+}
+
+template <> class C<float> {};
+template <typename T> class C<T&> {};
+
+template class C<double>;
+
+
+// As well as all the fun with ADL.
+
+namespace ADL {
+  struct Outer {};
+
+  inline namespace IL {
+    struct Inner {};
+
+    void fo(Outer);
+  }
+
+  void fi(Inner);
+
+  inline namespace IL2 {
+    void fi2(Inner);
+  }
+}
+
+void foo2() {
+  ADL::Outer o;
+  ADL::Inner i;
+  fo(o);
+  fi(i);
+  fi2(i);
+}
+
+// Let's not forget overload sets.
+struct Distinct {};
+inline namespace Over {
+  void over(Distinct);
+}
+void over(int);
+
+void foo3() {
+  Distinct d;
+  ::over(d);
+}