An alias can't be declared with a qualified-id in actual code, but in
diagnostics we want to know which scope it belongs to, and I think a
nested-name-specifier is the best way to provide that.

Tested x86_64-pc-linux-gnu, applying to trunk.

gcc/cp/ChangeLog:

        * error.cc (dump_decl): Check TFF_UNQUALIFIED_NAME.

gcc/testsuite/ChangeLog:

        * g++.dg/cpp0x/alias-decl-1.C: Expect qualified name.
---
 gcc/cp/error.cc                           | 2 ++
 gcc/testsuite/g++.dg/cpp0x/alias-decl-1.C | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/error.cc b/gcc/cp/error.cc
index 1e944ca3f75..2b07136b5ca 100644
--- a/gcc/cp/error.cc
+++ b/gcc/cp/error.cc
@@ -1246,6 +1246,8 @@ dump_decl (cxx_pretty_printer *pp, tree t, int flags)
              || flags & TFF_CLASS_KEY_OR_ENUM))
        {
          pp_cxx_ws_string (pp, "using");
+         if (! (flags & TFF_UNQUALIFIED_NAME))
+           dump_scope (pp, CP_DECL_CONTEXT (t), flags);
          dump_decl (pp, DECL_NAME (t), flags);
          pp_cxx_whitespace (pp);
          pp_cxx_ws_string (pp, "=");
diff --git a/gcc/testsuite/g++.dg/cpp0x/alias-decl-1.C 
b/gcc/testsuite/g++.dg/cpp0x/alias-decl-1.C
index 24b05209223..6dcb780e895 100644
--- a/gcc/testsuite/g++.dg/cpp0x/alias-decl-1.C
+++ b/gcc/testsuite/g++.dg/cpp0x/alias-decl-1.C
@@ -12,5 +12,5 @@ template<class U> struct Ptr<U*> {}; // { dg-error 
"specialization" }
 
 struct A {
     using A = int;  // { dg-error "11:ISO C\\+\\+ forbids nested type .A." }
-// { dg-error "11:.using A = int. has the same name as" "" { target c++11 } 
.-1 }  
+// { dg-error "11:.using A::A = int. has the same name as" "" { target c++11 } 
.-1 }  
 };

base-commit: a282da2243103d79262ca04f5e3a3cc7b9b06935
-- 
2.27.0

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