Introduce four new code-completion hooks for C++:

- after "using", show anything that can be a nested-name-specifier.
  - after "using namespace", show any visible namespaces or namespace aliases
  - after "namespace", show any namespace definitions in the current scope
  - after "namespace identifier = ", show any visible namespaces or
    namespace aliases

llvm-svn: 82251

clang/test/CodeCompletion/using-namespace.cpp

@@ -0,0 +1,24 @@
+// RUN: clang-cc -fsyntax-only -code-completion-dump=1 %s -o - | FileCheck -check-prefix=CC1 %s &&
+// RUN: true
+
+namespace N4 {
+  namespace N3 { }
+}
+
+class N3;
+
+namespace N2 {
+  namespace I1 { }
+  namespace I4 = I1;
+  namespace I5 { }
+  namespace I1 { }
+  
+  void foo() {
+    // CHECK-CC1: I1 : 2
+    // CHECK-CC1: I4 : 2
+    // CHECK-CC1: I5 : 2
+    // CHECK-CC1: N2 : 3
+    // CHECK-NEXT-CC1: N4 : 3
+    using namespace
+
+