Run 'make' to generate yagl.native. You may need to run "eval `opam config env`"
first.

IMPORTANT NOTE: any YAGL program MUST have a newline character at the end!

To run a program: concatenate it together with the standard library file, pipe
it into yagl.native, redirect it into an LLVM file, and run lli, as follows:

cat std.y [YOUR-FILE.y] | ./yagl.native > program.ll; lli program.ll