[PATCH] MSVC compat: Allow lookup of friend types in enclosing namespaces

[Richard Smith]

LGTM

================
Comment at: lib/Sema/SemaDecl.cpp:10740
@@ +10739,3 @@
+    // This tag should be declared in a namespace, which can only be enclosed by
+    // other namespaces.  Bail if something there's an anonymous namespace in
+    // the chain.
----------------
Stray 'something'?

================
Comment at: lib/Sema/SemaDecl.cpp:10986
@@ +10985,3 @@
+        NamedDecl *ND = Previous.getFoundDecl();
+        Sema::SemaDiagnosticBuilder D =
+            Diag(NameLoc, diag::ext_friend_tag_redecl_outside_namespace);
----------------
`auto`?

http://reviews.llvm.org/D4443