Teach the FixIt in DiagnoseInvalidRedeclaration how to replace the written
nested name specifiers in addition to the function's identifier when the
correction has a different nested name specifier.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158178 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/FixIt/fixit.cpp b/test/FixIt/fixit.cpp
index 86a2dd4..f5338cf 100644
--- a/test/FixIt/fixit.cpp
+++ b/test/FixIt/fixit.cpp
@@ -242,3 +242,21 @@
 }
 
 } // namespace arrow_suggest
+
+// Make sure fixing namespace-qualified identifiers functions properly with
+// namespace-aware typo correction/
+namespace redecl_typo {
+namespace Foo {
+  void BeEvil(); // expected-note {{'BeEvil' declared here}}
+}
+namespace Bar {
+  namespace Foo {
+    bool isGood(); // expected-note {{'Bar::Foo::isGood' declared here}}
+    void beEvil();
+  }
+}
+bool Foo::isGood() { // expected-error {{out-of-line definition of 'isGood' does not match any declaration in namespace 'redecl_typo::Foo'; did you mean 'Bar::Foo::isGood'?}}
+  return true;
+}
+void Foo::beEvil() {} // expected-error {{out-of-line definition of 'beEvil' does not match any declaration in namespace 'redecl_typo::Foo'; did you mean 'BeEvil'?}}
+}