Add support for doc(builtin)

luprex/core/cpp/main.cpp

@@ -4,6 +4,7 @@
 #include "lpxserver.hpp"
 #include "drivertests.hpp"
 #include "driver.hpp"
+#include "source.hpp"
 #include <iostream>
 
 struct EngineMaker {
@@ -33,6 +34,7 @@ static void usage() {
 
 int main(int argc, char **argv)
 {
+    SourceDB::register_lua_builtins();
     UniqueDrivenEngine engine;
     if (argc < 2) usage();
     std::string mode = argv[1];