Suggestion on wrapping C union with anonymous struct?

[Araq]

Depending on the library, you can avoid the `.header` altogether and rely on 
the ABI instead. Or you exploit the fact that an `importc`'ed type is well 
imported:
    
    
    {.pragma: impapi_typesHdr, header: tm_dir & "api_types.h".}
    type
      tm_tt_id_t* {.bycopy, union, impapi_typesHdr, importc: "struct 
tm_tt_id_t".} = object
        u64*: uint64
        `type`*: uint64
        generation*: uint64
        index*: uint64
    
    
    Run