closureiters: fixes #15243 (#15454) [backport:1.2]

* fixes #15243 [backport:1.2]

tests/async/tasyncawait_cyclebreaker.nim

@@ -1,66 +0,0 @@
-discard """
-  output: "20000"
-  cmd: "nim c -d:nimTypeNames -d:nimCycleBreaker $file"
-"""
-import asyncdispatch, asyncnet, nativesockets, net, strutils
-from stdtest/netutils import bindAvailablePort
-
-var msgCount = 0
-
-const
-  swarmSize = 400
-  messagesToSend = 50
-
-var clientCount = 0
-
-proc sendMessages(client: AsyncFD) {.async.} =
-  for i in 0 ..< messagesToSend:
-    await send(client, "Message " & $i & "\c\L")
-
-proc launchSwarm(port: Port) {.async.} =
-  for i in 0 ..< swarmSize:
-    var sock = createAsyncNativeSocket()
-
-    await connect(sock, "localhost", port)
-    await sendMessages(sock)
-    closeSocket(sock)
-
-proc readMessages(client: AsyncFD) {.async.} =
-  # wrapping the AsyncFd into a AsyncSocket object
-  var sockObj = newAsyncSocket(client)
-  var (ipaddr, port) = sockObj.getPeerAddr()
-  doAssert ipaddr == "127.0.0.1"
-  (ipaddr, port) = sockObj.getLocalAddr()
-  doAssert ipaddr == "127.0.0.1"
-  while true:
-    var line = await recvLine(sockObj)
-    if line == "":
-      closeSocket(client)
-      clientCount.inc
-      break
-    else:
-      if line.startswith("Message "):
-        msgCount.inc
-      else:
-        doAssert false
-
-proc createServer(server: AsyncFD) {.async.} =
-  discard server.SocketHandle.listen()
-  while true:
-    asyncCheck readMessages(await accept(server))
-
-let server = createAsyncNativeSocket()
-let port = bindAvailablePort(server.SocketHandle)
-asyncCheck createServer(server)
-asyncCheck launchSwarm(port)
-while true:
-  poll()
-  GC_collectZct()
-
-  let (allocs, deallocs) = getMemCounters()
-  doAssert allocs < deallocs + 1000
-
-  if clientCount == swarmSize: break
-
-assert msgCount == swarmSize * messagesToSend
-echo msgCount

tests/async/tbreak_must_exec_finally.nim

@@ -0,0 +1,25 @@
+discard """
+  output: '''
+finally handler 8
+do not duplicate this one
+'''
+"""
+
+# bug #15243
+
+import asyncdispatch
+
+proc f() {.async.} =
+  try:
+    while true:
+      try:
+        await sleepAsync(400)
+        break
+      finally:
+        var localHere = 8
+        echo "finally handler ", localHere
+  finally:
+    echo "do not duplicate this one"
+
+when isMainModule:
+  waitFor f()