re PR c++/56793 (ICE with scoped enum)

	PR c++/56793
	* typeck.c (finish_class_member_access_expr): Handle enum scope.

From-SVN: r197325

gcc/cp/ChangeLog

 2013-04-01  Jason Merrill  <jason@redhat.com>
 
+	PR c++/56793
+	* typeck.c (finish_class_member_access_expr): Handle enum scope.
+
 	PR c++/56794
 	* parser.c (cp_parser_range_for): Don't try to do auto deduction
 	in a template if the type of the range is incomplete.

gcc/cp/typeck.c

@@ -2684,6 +2684,23 @@ finish_class_member_access_expr (tree object, tree name, bool template_p,
 	      return error_mark_node;
 	    }
 
+	  if (TREE_CODE (scope) == ENUMERAL_TYPE)
+	    {
+	      /* Looking up a member enumerator (c++/56793).  */
+	      if (!TYPE_CLASS_SCOPE_P (scope)
+		  || !DERIVED_FROM_P (TYPE_CONTEXT (scope), object_type))
+		{
+		  if (complain & tf_error)
+		    error ("%<%D::%D%> is not a member of %qT",
+			   scope, name, object_type);
+		  return error_mark_node;
+		}
+	      tree val = lookup_enumerator (scope, name);
+	      if (TREE_SIDE_EFFECTS (object))
+		val = build2 (COMPOUND_EXPR, TREE_TYPE (val), object, val);
+	      return val;
+	    }
+
 	  gcc_assert (CLASS_TYPE_P (scope));
 	  gcc_assert (identifier_p (name) || TREE_CODE (name) == BIT_NOT_EXPR);
 

gcc/testsuite/g++.dg/cpp0x/enum25.C

+// PR c++/56793
+// { dg-require-effective-target c++11 }
+
+struct A
+{
+  enum struct B {X, Y} b;
+} a;
+
+enum struct D {X,Y};
+struct C { } c;
+
+int main ()
+{
+  if (a.b == a.B::Y)
+    a.b = A::B::X;
+
+  c.D::Y;			// { dg-error "not a member" }
+}