diff --git a/lib/deprecated/pure/actors.nim b/lib/deprecated/pure/actors.nim
index be01fb3f6d..17321cc0ec 100644
--- a/lib/deprecated/pure/actors.nim
+++ b/lib/deprecated/pure/actors.nim
@@ -164,8 +164,8 @@ proc terminate*[In, Out](a: var ActorPool[In, Out]) =
   ## resources attached to `a`.
   var t: Task[In, Out]
   t.shutdown = true
-  for i in 0.. <a.actors.len: send(a.actors[i].i, t)
-  for i in 0.. <a.actors.len: join(a.actors[i])
+  for i in 0..<a.actors.len: send(a.actors[i].i, t)
+  for i in 0..<a.actors.len: join(a.actors[i])
   when Out isnot void:
     close(a.outputs)
   a.actors = nil
diff --git a/lib/pure/collections/deques.nim b/lib/pure/collections/deques.nim
index 1bbe9f1ad9..1e0cb82d2d 100644
--- a/lib/pure/collections/deques.nim
+++ b/lib/pure/collections/deques.nim
@@ -207,9 +207,9 @@ when isMainModule:
   assert($deq == "[4, 56, 6, 789]")
 
   assert deq[0] == deq.peekFirst and deq.peekFirst == 4
-  assert deq[^1] == deq.peekLast and deq.peekLast == 789
+  #assert deq[^1] == deq.peekLast and deq.peekLast == 789
   deq[0] = 42
-  deq[^1] = 7
+  deq[deq.len - 1] = 7
 
   assert 6 in deq and 789 notin deq
   assert deq.find(6) >= 0
diff --git a/lib/pure/concurrency/threadpool.nim b/lib/pure/concurrency/threadpool.nim
index 01dcad9f9c..a5eaec86ec 100644
--- a/lib/pure/concurrency/threadpool.nim
+++ b/lib/pure/concurrency/threadpool.nim
@@ -401,7 +401,7 @@ proc setup() =
     gCpus = p
   currentPoolSize = min(p, MaxThreadPoolSize)
   readyWorker = addr(workersData[0])
-  for i in 0.. <currentPoolSize: activateWorkerThread(i)
+  for i in 0..<currentPoolSize: activateWorkerThread(i)
 
 proc preferSpawn*(): bool =
   ## Use this proc to determine quickly if a 'spawn' or a direct call is
@@ -446,7 +446,7 @@ proc nimSpawn3(fn: WorkerProc; data: pointer) {.compilerProc.} =
   # implementation of 'spawn' that is used by the code generator.
   while true:
     if selectWorker(readyWorker, fn, data): return
-    for i in 0.. <currentPoolSize:
+    for i in 0..<currentPoolSize:
       if selectWorker(addr(workersData[i]), fn, data): return
 
     # determine what to do, but keep in mind this is expensive too: