fixes #10795

tests/threads/t8535.nim

@@ -1,16 +1,29 @@
 discard """
-  output: "0"
+  output: '''0
+hello'''
 """
 
 type
-  CircAlloc* [Size: static[int] , T]  =  tuple
-    baseArray           : array[Size,T]
-    index               : uint16
+  CircAlloc*[Size: static[int], T] = tuple
+    baseArray: array[Size,T]
+    index: uint16
 
 type
   Job = object of RootObj
 
-var foo {.threadvar.}: CircAlloc[1,Job]
+var foo {.threadvar.}: CircAlloc[1, Job]
 
 when true:
   echo foo.index
+
+
+# bug #10795
+import asyncdispatch
+import threadpool
+
+proc f1() =
+  waitFor sleepAsync(100)
+  echo "hello"
+
+spawn f1()
+sync()