patch 8.1.0519: cannot save and restore the tag stack
Problem: Cannot save and restore the tag stack.
Solution: Add gettagstack() and settagstack(). (Yegappan Lakshmanan,
closes #3604)
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 1ec743a..7c3f358 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -1028,6 +1028,8 @@
taglist() get list of matching tags
tagfiles() get a list of tags files
+ gettagstack() get the tag stack
+ settagstack() modify the tag stack
luaeval() evaluate Lua expression
mzeval() evaluate |MzScheme| expression