fix #9695 asyncmacro: tfuturevar fails when activated [backport: 1.0] (#16090)

* fix asyncmacro

* Apply suggestions from code review

* Update lib/pure/asyncmacro.nim

(cherry picked from commit 6f1a72069a)

lib/pure/asyncmacro.nim

@@ -118,7 +118,8 @@ proc getFutureVarIdents(params: NimNode): seq[NimNode] {.compileTime.} =
   for i in 1 ..< len(params):
     expectKind(params[i], nnkIdentDefs)
     if params[i][1].kind == nnkBracketExpr and
-       params[i][1][0].eqIdent("futurevar"):
+       params[i][1][0].eqIdent(FutureVar.astToStr):
+      ## eqIdent: first char is case sensitive!!!
       result.add(params[i][0])
 
 proc isInvalidReturnType(typeName: string): bool =

tests/async/tfuturevar.nim

@@ -1,8 +1,3 @@
-discard """
-action: compile
-"""
-# XXX: action should be run!
-
 import asyncdispatch
 
 proc completeOnReturn(fut: FutureVar[string], x: bool) {.async.} =