Most people will have no need for the files in this directory.
It contains the bison and flex code that is used to generate C code
for the Mup parser. The generated code is provided in the directory
above, so that you can build Mup with just an ordinary C compiler,
without needing the bison and flex tools.
However, if you are familiar with bison and flex
and want to do something special with the parsing code,
the input files are provided here.
