This directory contains a very simple example of a calculator in lrpar that uses the generic parse tree output of lrpar. cargo build processes src/calc.l and src/calc.y at compile-time. The compiled program then takes input from stdin. You can type anything in here (though you'll only get useful output for valid input!) -- parsing and lexing errors are reported.

Look at build.rs, src/calc.y, and src/main.rs to see how to use lrpar in your project.