re PR c++/50491 ([C++0x] [4.6/4.7 Regression] "unexpected ast of kind…

re PR c++/50491 ([C++0x] [4.6/4.7 Regression] "unexpected ast of kind using_decl" on call to using'ed grandparent member function)

/cp
2011-09-22  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/50491
	* semantics.c (potential_constant_expression_1): Handle USING_DECL.

/testsuite
2011-09-22  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/50491
	* g++.dg/cpp0x/pr50491.C: New.

From-SVN: r179109

gcc/cp/ChangeLog

 2011-09-22  Paolo Carlini  <paolo.carlini@oracle.com>
 
+	PR c++/50491
+	* semantics.c (potential_constant_expression_1): Handle USING_DECL.
+
+2011-09-22  Paolo Carlini  <paolo.carlini@oracle.com>
+
 	PR c++/50371
 	* pt.c (invalid_nontype_parm_type_p): Handle NULLPTR_TYPE.
 

gcc/cp/semantics.c

@@ -7751,6 +7751,7 @@ potential_constant_expression_1 (tree t, bool want_rval, tsubst_flags_t flags)
       /* We can see a FIELD_DECL in a pointer-to-member expression.  */
     case FIELD_DECL:
     case PARM_DECL:
+    case USING_DECL:
       return true;
 
     case AGGR_INIT_EXPR:

gcc/testsuite/ChangeLog

+2011-09-22  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/50491
+	* g++.dg/cpp0x/pr50491.C: New.
+
 2011-09-22  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	PR testsuite/50487

gcc/testsuite/g++.dg/cpp0x/pr50491.C

+// { dg-options "-std=c++0x" }
+
+struct GrandParent {
+  void *get();
+};
+
+template<class OBJ>
+struct Parent : public GrandParent{
+};
+
+template<typename T>
+struct Child : public Parent<T> {
+  using GrandParent::get;
+  void Foo() {
+    void* ex = get();
+  }
+};