More empty stmt fixes.

tests/async/tasyncawait.nim

@@ -21,15 +21,8 @@ proc launchSwarm(port: TPort) {.async.} =
     var sock = newAsyncRawSocket()
 
     await connect(sock, "localhost", port)
-    when true:
-      await sendMessages(sock)
-      closeSocket(sock)
-    else:
-      # Issue #932: https://github.com/Araq/Nim/issues/932
-      var msgFut = sendMessages(sock)
-      msgFut.callback =
-        proc () =
-          closeSocket(sock)
+    await sendMessages(sock)
+    closeSocket(sock)
 
 proc readMessages(client: TAsyncFD) {.async.} =
   while true:

tests/async/tasyncdiscard.nim

@@ -13,7 +13,7 @@ discard """
 import asyncio, asyncdispatch, asyncnet
 
 proc main {.async.} =
-  proc f: PFuture[int] {.async.} =
+  proc f: Future[int] {.async.} =
     discard
     echo 1
     discard
@@ -24,7 +24,7 @@ proc main {.async.} =
   echo x
   echo 3
 
-  proc g: PFuture[int] {.async.} =
+  proc g: Future[int] {.async.} =
     discard
     echo 4
     discard