-* Bison now parses C99 lexical constructs like digraphs, UCNs, and
- backslash-newline within C escape sequences, as POSIX now requires.
+* %destructor
+ It is now possible to reclaim the memory associated to symbols
+ discarded during error recovery. This feature is still experimental.
+
+* Bison now parses C99 lexical constructs like UCNs and
+ backslash-newline within C escape sequences, as POSIX 1003.1-2001 requires.