This comment in Parser.cpp:

```
// Passing 0 arguments beyond the type to RETURN_NODE_REF is invalid because of a stupid limitation of the C preprocessor
#define RETURN_NODE_REF_NO_ARGS(type) \
    return { makeUniqueRef<AST::type>(CURRENT_SOURCE_SPAN()) };
```

Change be fixed with __VA_OPT__ 

https://stackoverflow.com/questions/68484818/function-like-macros-with-c20-va-opt-error-in-manual-code