* src/reader.c (token_translations_init): 256 is now the default

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 57fab5304125eb229476b01816fbe7e83356bb2b..23d628ea525f5d5aa21ac953d186ed9b8c9af297 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,46 @@ Bison News
 
 Changes in version 1.49a:
 
+* Undefined token
+  The undefined token was systematically mapped to 2 which prevented
+  the use of 2 from the user.  This is no longer the case.
+
+* Undefined token
+  If yylex returned a code out of range, yyparse could die.  This is
+  no longer the case.
+
+* Error token
+  According to POSIX, the error token should be numbered as 256.
+  Bison extends this requirement by making it a preference: *if* the
+  user specified that one of her tokens is numbered 256, then error
+  will be mapped onto another number.
+
+* Large grammars
+  Are now supported (large token numbers, large grammar size (= sum of
+  the LHS and RHS lengths).
+
+* The initial rule is explicit.
+  Bison used to play hacks with the initial rule, which the user does
+  not write.  It is now explicit, and visible in the reports and
+  graphs as rule 0.
+
+* Useless rules are actually removed.
+  Before, Bison reported the useless rules, but, although not used,
+  included them in the parsers.
+
+* False `Token not used' report fixed.
+  On a grammar such as
+
+           %token useless useful
+           %%
+           exp: '0' %prec useful;
+
+  where a token was used to set the precedence of the last rule,
+  bison reported both `useful' and `useless' as useless tokens.
+
+* Revert the C++ namespace changes introduced in 1.31, as they caused too
+  many portability hassles.
+
 * Items overflow
   Bison no longer dumps core when there are too many items, it just
   dies.