undefined but unused is a warning

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index fd749368d50ebcfa12ffcb784fd99b2ee572b346..0368c0e1930410580a2385dab89594a46fbec2ee 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -36,18 +36,17 @@ GNU Bison NEWS
     3.28-34: warning: type <type3> is used, but is not associated to any symbol
     4.28-34: warning: type <type4> is used, but is not associated to any symbol
 
-*** Undeclared symbols
+*** Undefined but unused symbols
 
-  Bison used to raise an error for %printer and %destructor directives for
-  undefined symbols.
+  Bison used to raise an error for undefined symbols that are not used in
+  the grammar.  This is now only a warning.
 
     %printer    {} symbol1
     %destructor {} symbol2
+    %type <type>   symbol3
     %%
     exp: "a";
 
-  This is now only a warning.
-
 *** Useless destructors or printers
 
   Bison now warns about useless destructors or printers.  In the following
@@ -85,13 +84,13 @@ GNU Bison NEWS
 
 ** C++ skeletons improvements
 
-*** parser header (%defines) is no longer mandatory (lalr1.cc)
+*** The parser header is no longer mandatory (lalr1.cc, glr.cc)
 
-  In which case, if needed, the support classes are defined in the generated
-  parser, instead of additional files (location.hh, position.hh and
-  stack.hh).
+  Using %defines is now optional.  Without it, the needed support classes
+  are defined in the generated parser, instead of additional files (such as
+  location.hh, position.hh and stack.hh).
 
-*** locations are no longer mandatory (lalr1.cc, glr.cc)
+*** Locations are no longer mandatory (lalr1.cc, glr.cc)
 
   Both lalr1.cc and glr.cc no longer require %location.