How to convert sequence of objects to JSON in Nim?

[dom96]

Yeah, you really shouldn't use `marshal`, especially when `json` gives you 
exactly the same output with very few changes:
    
    
    import json
    
    type
      DocKind = enum
        TextDoc, TodoDoc
      DocItem = object
        case kind:DocKind
        of TextDoc:
          text: string
        of TodoDoc:
          todo: string
        tags: seq[string]
    
    
    var docs: seq[DocItem]
    
    docs.add DocItem(kind:TextDoc, text: "some doc", tags: @["help"])
    docs.add DocItem(kind:TodoDoc,todo: "some todo")
    
    echo %docs
    
    
    Run

And yes, @alexeypetrushin, I would suggest avoiding inheritance as much as you 
can. Object variants are the way to go.