Replace countup(x, y-1) with x ..< y

compiler/vmgen.nim

@@ -366,7 +366,7 @@ proc genIf(c: PCtx, n: PNode; dest: var TDest) =
   #  Lend:
   if dest < 0 and not isEmptyType(n.typ): dest = getTemp(c, n.typ)
   var endings: seq[TPosition] = @[]
-  for i in countup(0, len(n) - 1):
+  for i in 0 ..< len(n):
     var it = n.sons[i]
     if it.len == 2:
       withTemp(tmp, it.sons[0].typ):
@@ -436,7 +436,7 @@ proc sameConstant*(a, b: PNode): bool =
     of nkEmpty: result = true
     else:
       if sonsLen(a) == sonsLen(b):
-        for i in countup(0, sonsLen(a) - 1):
+        for i in 0 ..< sonsLen(a):
           if not sameConstant(a.sons[i], b.sons[i]): return
         result = true
 
@@ -1739,10 +1739,10 @@ proc genArrAccess(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags) =
 proc getNullValueAux(obj: PNode, result: PNode; conf: ConfigRef) =
   case obj.kind
   of nkRecList:
-    for i in countup(0, sonsLen(obj) - 1): getNullValueAux(obj.sons[i], result, conf)
+    for i in 0 ..< sonsLen(obj): getNullValueAux(obj.sons[i], result, conf)
   of nkRecCase:
     getNullValueAux(obj.sons[0], result, conf)
-    for i in countup(1, sonsLen(obj) - 1):
+    for i in 1 ..< sonsLen(obj):
       getNullValueAux(lastSon(obj.sons[i]), result, conf)
   of nkSym:
     let field = newNodeI(nkExprColonExpr, result.info)
@@ -1784,11 +1784,11 @@ proc getNullValue(typ: PType, info: TLineInfo; conf: ConfigRef): PNode =
     getNullValueAux(t.n, result, conf)
   of tyArray:
     result = newNodeIT(nkBracket, info, t)
-    for i in countup(0, int(lengthOrd(conf, t)) - 1):
+    for i in 0 ..< int(lengthOrd(conf, t)):
       addSon(result, getNullValue(elemType(t), info, conf))
   of tyTuple:
     result = newNodeIT(nkTupleConstr, info, t)
-    for i in countup(0, sonsLen(t) - 1):
+    for i in 0 ..< sonsLen(t):
       addSon(result, getNullValue(t.sons[i], info, conf))
   of tySet:
     result = newNodeIT(nkCurly, info, t)