Added test for issue #911.

tests/macros/tgensym.nim

@@ -0,0 +1,62 @@
+import rawsockets, asyncdispatch, macros
+var p = newDispatcher()
+var sock = newAsyncRawSocket()
+
+proc convertReturns(node, retFutureSym: PNimrodNode): PNimrodNode {.compileTime.} =
+  case node.kind
+  of nnkReturnStmt:
+    result = newCall(newIdentNode("complete"), retFutureSym, node[0])
+  else:
+    result = node
+    for i in 0 .. <node.len:
+      result[i] = convertReturns(node[i], retFutureSym)
+
+macro async2(prc: stmt): stmt {.immediate.} =
+  expectKind(prc, nnkProcDef)
+
+  var outerProcBody = newNimNode(nnkStmtList)
+
+  # -> var retFuture = newFuture[T]()
+  var retFutureSym = newIdentNode("retFuture") #genSym(nskVar, "retFuture")
+  outerProcBody.add(
+    newVarStmt(retFutureSym, 
+      newCall(
+        newNimNode(nnkBracketExpr).add(
+          newIdentNode("newFuture"),
+          prc[3][0][1])))) # Get type from return type of this proc.
+
+  # -> iterator nameIter(): PFutureBase {.closure.} = <proc_body>
+  # Changing this line to: newIdentNode($prc[0].ident & "Iter") # will make it work.
+  var iteratorNameSym = genSym(nskIterator, $prc[0].ident & "Iter")
+  var procBody = prc[6].convertReturns(retFutureSym)
+
+  var closureIterator = newProc(iteratorNameSym, [newIdentNode("PFutureBase")],
+                                procBody, nnkIteratorDef)
+  closureIterator[4] = newNimNode(nnkPragma).add(newIdentNode("closure"))
+  outerProcBody.add(closureIterator)
+
+  # -> var nameIterVar = nameIter
+  # -> var first = nameIterVar()
+  var varNameIterSym = newIdentNode($prc[0].ident & "IterVar") #genSym(nskVar, $prc[0].ident & "IterVar")
+  var varNameIter = newVarStmt(varNameIterSym, iteratorNameSym)
+  outerProcBody.add varNameIter
+  var varFirstSym = genSym(nskVar, "first")
+  var varFirst = newVarStmt(varFirstSym, newCall(varNameIterSym))
+  outerProcBody.add varFirst
+
+
+  result = prc
+
+  # Remove the 'closure' pragma.
+  for i in 0 .. <result[4].len:
+    if result[4][i].ident == !"async":
+      result[4].del(i)
+
+  result[6] = outerProcBody
+
+proc readStuff(): PFuture[string] {.async2.} =
+  var fut = connect(sock, "irc.freenode.org", TPort(6667))
+  yield fut
+  var fut2 = recv(sock, 50)
+  yield fut2
+  return fut2.read