This object contains implicit conversions that come in handy when using the ^^' combinator
{@see Parsers} to construct an AST from the concrete syntax.
JavaTokenParsers differs from RegexParsers
by adding the following definitions:
PackratParsers is a component that extends the parser combinators
provided by Parsers with a memoization facility
(Packrat Parsing).
Parsers is a component that provides generic parser combinators.
The most important differences between RegexParsers and
Parsers are: