gistfile1.nim

import macros, strutils

macro unrolledLoop (name: expr, start, fin: int; body: stmt): stmt {.immediate.} =
  result = newStmtList()
  for x in start.intval .. fin.intval:
    var res = newStmtList()
    res.add parseStmt("const $1 = $2".format(name, x))
    res.add body.copyNimTree
    result.add newBlockStmt(res)
  

unrolledLoop(i, 0, 10):
  var x: array[0 .. i, char]
  echo i, ": ", sizeof(x)