Merge pull request #6944 from alehander42/fix-discardable

Make asyncjs Future[void] play nicely with last line discardable calls & forward declaration

tests/js/tasync.nim

@@ -1,8 +1,8 @@
 discard """
   disabled: true
   output: '''
-0
 x
+e
 '''
 """
 
@@ -10,16 +10,22 @@ import asyncjs
 
 # demonstrate forward definition
 # for js
-proc y(e: int): Future[string]
+proc y(e: int): Future[string] {.async.}
 
-proc x(e: int) {.async.} =
+proc e: int {.discardable.} =
+  echo "e"
+  return 2
+
+proc x(e: int): Future[void] {.async.} =
   var s = await y(e)
   echo s
+  e()
 
 proc y(e: int): Future[string] {.async.} =
-  echo 0
-  return "x"
-
+  if e > 0:
+    return await y(0)
+  else:
+    return "x"
 
 
 discard x(2)