Bison 3.3 released

Version 3.3 of the Bison parser generator is out.
'The new option --update replaces deprecated features with their modern
spelling, but also applies fixes such as eliminating duplicate directives,
etc. It is now possible to annotate rules with their number of expected
conflicts. Bison can be made relocatable. The symbol declaration syntax
was overhauled, and in particular, %nterm, that exists since the origins of
Bison, is now an officially supported (and documented!) feature. C++
parsers now feature genuine symbol constructors, and use noexcept/constexpr.
The GLR parsers in C++ now support the syntax_error exceptions. There are
also many smaller improvements, including a fix for a bug which is at least
31 years old.'