[C++ PATCH] PR c++80891 case #4

[Nathan Sidwell]

this fixes the 4th testcase.  I'd flubbed the sense of an assert.

nathan

--
Nathan Sidwell

2017-05-29  Nathan Sidwell  <nat...@acm.org>

	PR c++/80891 (#4)
	* ptree.c (cxx_print_xnode): Show internal OVERLOAD structure.
	* tree.c (ovl_insert, ovl_iterator_remove_node): Fix copying assert.

	PR c++/80891 (#4)
	* g++.dg/lookup/pr80891-4.C: New.

Index: cp/ptree.c
===================================================================
--- cp/ptree.c	(revision 248574)
+++ cp/ptree.c	(working copy)
@@ -236,11 +236,8 @@ cxx_print_xnode (FILE *file, tree node,
 		  indent + 4);
       break;
     case OVERLOAD:
-      print_node (file, "name", OVL_NAME (node), indent+4);
-      for (ovl_iterator iter (node, true); iter; ++iter)
-	print_node (file,
-		    TREE_CODE (*iter) == OVERLOAD ? "inner" : "function",
-		    *iter, indent+4);
+      print_node (file, "function", OVL_FUNCTION (node), indent+4);
+      print_node (file, "next", OVL_CHAIN (node), indent+4);
       break;
     case TEMPLATE_PARM_INDEX:
       print_node (file, "decl", TEMPLATE_PARM_DECL (node), indent+4);
Index: cp/tree.c
===================================================================
--- cp/tree.c	(revision 248574)
+++ cp/tree.c	(working copy)
@@ -2170,7 +2170,7 @@ ovl_insert (tree fn, tree maybe_ovl, boo
 		       | (OVL_USING_P (maybe_ovl) << 0))))
     {
       gcc_checking_assert (!OVL_LOOKUP_P (maybe_ovl)
-			   && (!OVL_USED_P (maybe_ovl) || !copying));
+			   && (!copying || OVL_USED_P (maybe_ovl)));
       if (OVL_USED_P (maybe_ovl))
 	{
 	  copying = true;
@@ -2264,7 +2264,7 @@ ovl_iterator::remove_node (tree overload
     {
       tree probe = *slot;
       gcc_checking_assert (!OVL_LOOKUP_P (probe)
-			   && (!OVL_USED_P (probe) || !copying));
+			   && (!copying || OVL_USED_P (probe)));
       if (OVL_USED_P (probe))
 	{
 	  copying = true;
Index: testsuite/g++.dg/lookup/pr80891-4.C
===================================================================
--- testsuite/g++.dg/lookup/pr80891-4.C	(revision 0)
+++ testsuite/g++.dg/lookup/pr80891-4.C	(working copy)
@@ -0,0 +1,13 @@
+// PR c++/80891 part 4
+// Inserting into an immutable overload set
+
+namespace tuples {
+template <class, class> void get();
+template <int> void get();
+}
+using tuples::get;
+template <class RandomAccessIterator> void make_iterator_vertex_map() {
+  RandomAccessIterator a;
+  a, get;
+}
+template <class> void get();