It says <info> app: do_lua: ld

The fact that it's logging is a definite quantum of progress, but I rather hoped to see 42 here, not ld

``` int ret = luaL_dostring(L, "return tostring(6*7);"); const char * str = lua_tostring(L, -1);

 if (ret) {
   NRF_LOG_INFO("Error: %s", str);
 } else {
   NRF_LOG_INFO("do_lua: %s", str);
 }

```

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