he default.
  For instance
    %token MYEOF 0
  or
    %token MYEOF 0 "end of file"

** Semantic parser
  This old option, which has been broken for ages, is removed.

** New translations
  Brazilian Portuguese, thanks to Alexandre Folle de Menezes.
  Croatian, thanks to Denis Lackovic.

** Incorrect token definitions
  When given
    %token 'a' "A"
  bison used to output
    #define 'a' 65

** Token definitions as enums
  Tokens are output both as the traditional #define's, and, provided
  the compiler supports ANSI C or is a C++ compiler, as enums.
  This lets debuggers display names instead of integers.

** Reports
  In addition to --verbose, bison supports --report=THINGS, which
  produces additional information:
  - itemset
    complete the core item sets with their closure
  - lookahead [changed to "look-ahead" in 1.875e through 2.3, but changed back]
    explicitly associate lookahead tokens to items
  - solved
    describe shift/reduce conflicts solving.
    Bison used to systematically output this information on top of
    the report.  Solved conflicts are now attached to their states.

** Type clashes
  Previous versions don't complain when there is a type clash on
  the default action if the rule has a midrule action, such as in:

    %type <foo> bar
    %%
    bar: '0' {} '0';

  This is fixed.

** GNU M4 is now required when using Bison.