Re: the "type" of the curly-bracket structure

[jcosborn]

You can also use AST based overloading 
[https://nim-lang.org/docs/manual_experimental.html#ast-based-overloading](https://nim-lang.org/docs/manual_experimental.html#ast-based-overloading)
 (which isn't actually experimental even though it appears there). In this case 
all the overloads will need to be untyped to avoid typechecking invalid AST. 
    
    
    import macros
    
    macro `@@@`(x: untyped{nkTableConstr}): untyped =
      echo x.treerepr
      result = newNimNode(nnkTableConstr).add(x[0])
    
    macro `@@@`(x: untyped{nkBracket}): untyped =
      echo x.treerepr
      result = x
    
    macro `@@@`(x: untyped{nkStrLit}): untyped =
      echo x.treerepr
      result = x
    
    var a = @@@{"fromStruct": "blah", "sub": {"joe": 10}}
    var b = @@@[1,2,3]
    var c = @@@"test"
    
    
    Run