Using Ruby as a slave interpreter

#include "ruby.h"

void uses_ruby() {
  RUBY_INIT_STACK;
  rb_eval_string("puts x");
}

int main(int argc, char **argv) {
  VALUE result;

  ruby_sysinit(&argc, &argv);
  RUBY_INIT_STACK;
  ruby_init();
  ruby_init_loadpath();

  rb_eval_string("x = 1; puts x");

  uses_ruby();

  return ruby_cleanup(0);
}