string result from macro

[Krux02]

Normally I would think that when I return a value from a macro or set the 
result to that value. There would be no difference. But aparently there is:
    
    
    import macros
    
    macro testA: string =
      result = newLit("testA")
    
    macro testB: untyped =
      newLit("testB")
    
    macro testC: untyped =
      return newLit("testC")
    
    macro testD: string =
      newLit("testD")
    
    macro testE: string =
      return newLit("testE")
    

I get the following error message: 
    
    
    scratch.nim(14, 3) Error: type mismatch: got (NimNode) but expected 'string'
    
    Compilation exited abnormally with code 1 at Fri May 19 14:16:02
    

I think this is weird, because when I just set result, everything works.