PR c++/71710 - template using directive of field

	PR c++/71710 - template using directive of field
	* pt.c (tsubst_copy_and_build [COMPONENT_REF]): Move FIELD_DECL
	check earlier.

	PR C++/71710
	* g++.dg/template/pr71710.C: New.

From-SVN: r244833

gcc/cp/ChangeLog

 2017-01-23  Nathan Sidwell  <nathan@acm.org>
 
+	PR c++/71710 - template using directive of field
+	* pt.c (tsubst_copy_and_build [COMPONENT_REF]): Move FIELD_DECL
+	check earlier.
+
 	PR c++/71406 - ICE with scope-ref'd template id exprs
 	PR c++/77508
 	* typeck.c (finish_class_member_access_expr): Break up SCOPE_REF

gcc/cp/pt.c

@@ -17470,7 +17470,14 @@ tsubst_copy_and_build (tree t,
 	if (member == error_mark_node)
 	  RETURN (error_mark_node);
 
-	if (type_dependent_expression_p (object))
+	if (TREE_CODE (member) == FIELD_DECL)
+	  {
+	    r = finish_non_static_data_member (member, object, NULL_TREE);
+	    if (TREE_CODE (r) == COMPONENT_REF)
+	      REF_PARENTHESIZED_P (r) = REF_PARENTHESIZED_P (t);
+	    RETURN (r);
+	  }
+	else if (type_dependent_expression_p (object))
 	  /* We can't do much here.  */;
 	else if (!CLASS_TYPE_P (object_type))
 	  {
@@ -17535,13 +17542,6 @@ tsubst_copy_and_build (tree t,
 	      }
 	    RETURN (error_mark_node);
 	  }
-	else if (TREE_CODE (member) == FIELD_DECL)
-	  {
-	    r = finish_non_static_data_member (member, object, NULL_TREE);
-	    if (TREE_CODE (r) == COMPONENT_REF)
-	      REF_PARENTHESIZED_P (r) = REF_PARENTHESIZED_P (t);
-	    RETURN (r);
-	  }
 
 	r = finish_class_member_access_expr (object, member,
 					     /*template_p=*/false,

gcc/testsuite/ChangeLog

 2017-01-23  Nathan Sidwell  <nathan@acm.org>
 
+	PR C++/71710
+	* g++.dg/template/pr71710.C: New.
+
 	PR c++/71406
 	PR c++/77508
 	* g++.dg/template/pr71406.C: New.

gcc/testsuite/g++.dg/template/pr71710.C

+// { dg-do compile { target c++11 } }
+// PR C++/71710 ICE with decltype & using
+
+template < typename > struct A
+{
+  A a;
+  template < int > using B = decltype (a);
+  B < 0 > b;
+  template < int C > B < C > foo ();
+};