X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/f91b1629440cb52b851004570b7f280e79167383..12e3584054c16ab255672c07af0ffc7bb220e8bc:/NEWS

diff --git a/NEWS b/NEWS
index 75e0284f..c3fe6d03 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,25 @@ Changes in version 2.3a+ (????-??-??):
 * The -g and --graph options now output graphs in Graphviz DOT format,
   not VCG format.
 
+* Bison now recognizes two separate kinds of default %destructor's and
+  %printer's:
+
+    1. Place `<*>' in a %destructor/%printer symbol list to define a default
+       %destructor/%printer for all grammar symbols for which you have formally
+       declared semantic type tags.
+
+    2. Place `<!>' in a %destructor/%printer symbol list to define a default
+       %destructor/%printer for all grammar symbols without declared semantic
+       type tags.
+
+  Bison no longer supports the `%symbol-default' notation from Bison 2.3a.
+  `<*>' and `<!>' combined achieve the same effect with one exception: Bison no
+  longer applies any %destructor to a mid-rule value if that mid-rule value is
+  not actually ever referenced using either $$ or $n in a semantic action.
+
+  See the section `Freeing Discarded Symbols' in the Bison manual for further
+  details.
+
 * The Yacc prologue alternatives from Bison 2.3a have been rewritten as the
   following directives: