How to get string representation of int inside of the macros?

[r3d9u11]

Hello. I tried to represent int to string inside a macros: 
    
    
    import macros
    
    macro initNui(a:int): typed =
      result = parseStmt("const b=" & $a)
    
    initNui(1)
    

but I had compilcation error: 
    
    
    unhandled exception: false Invalid node kind nnkIntLit for macros.`$`
    

What I'm doing wrong? How I can to get string representation of int without $ 
operator?