Add main code to tie it all together

code/compiler_main.cpp

@@ -0,0 +1,14 @@
+#include "compiler_ast.hpp"
+#include "compiler_parser.hpp"
+
+void yy::parser::error(const std::string& msg) {
+    std::cout << "An error occured: " << std::endl;
+}
+
+extern std::vector<definition_ptr> program;
+
+int main() {
+    yy::parser parser;
+    parser.parse();
+    std::cout << program.size() << std::endl;
+}