make async tests green again

(cherry picked from commit ac458448d8)

lib/pure/asyncfutures.nim

@@ -31,6 +31,10 @@ when not defined(release):
   var currentID = 0
 
 const isFutureLoggingEnabled* = defined(futureLogging)
+
+const
+  NimAsyncContinueSuffix* = "NimAsyncContinue" ## For internal usage. Do not use.
+
 when isFutureLoggingEnabled:
   import hashes
   type
@@ -294,7 +298,7 @@ proc getHint(entry: StackTraceEntry): string =
     if cmpIgnoreStyle(entry.filename, "asyncdispatch.nim") == 0:
       return "Processes asynchronous completion events"
 
-  if entry.procname.endsWith("_continue"):
+  if entry.procname.endsWith(NimAsyncContinueSuffix):
     if cmpIgnoreStyle(entry.filename, "asyncmacro.nim") == 0:
       return "Resumes an async procedure"
 

lib/pure/asyncmacro.nim

@@ -308,9 +308,9 @@ proc asyncSingleProc(prc: NimNode): NimNode {.compileTime.} =
     outerProcBody.add(closureIterator)
 
     # -> createCb(retFuture)
-    # NOTE: The "_continue" suffix is checked for in asyncfutures.nim to produce
+    # NOTE: The NimAsyncContinueSuffix is checked for in asyncfutures.nim to produce
     # friendlier stack traces:
-    var cbName = genSym(nskProc, prcName & "Continue")
+    var cbName = genSym(nskProc, prcName & NimAsyncContinueSuffix)
     var procCb = getAst createCb(retFutureSym, iteratorNameSym,
                          newStrLitNode(prcName),
                          cbName,