Merge pull request #7991 from yglukhov/fix-7985

Fixes #7985

compiler/closureiters.nim

@@ -397,18 +397,17 @@ proc hasYieldsInExpressions(n: PNode): bool =
 
 proc exprToStmtList(n: PNode): tuple[s, res: PNode] =
   assert(n.kind == nkStmtListExpr)
-
-  var parent = n
-  var lastSon = n[^1]
-
-  while lastSon.kind == nkStmtListExpr:
-    parent = lastSon
-    lastSon = lastSon[^1]
-
   result.s = newNodeI(nkStmtList, n.info)
-  result.s.sons = parent.sons
-  result.s.sons.setLen(result.s.sons.len - 1) # delete last son
-  result.res = lastSon
+  result.s.sons = @[]
+
+  var n = n
+  while n.kind == nkStmtListExpr:
+    result.s.sons.add(n.sons)
+    result.s.sons.setLen(result.s.sons.len - 1) # delete last son
+    n = n[^1]
+
+  result.res = n
+
 
 proc newEnvVarAsgn(ctx: Ctx, s: PSym, v: PNode): PNode =
   result = newTree(nkFastAsgn, ctx.newEnvVarAccess(s), v)

tests/async/t7985.nim

@@ -0,0 +1,19 @@
+discard """
+  file: "t7985.nim"
+  exitcode: 0
+  output: "(value: 1)"
+"""
+import json, asyncdispatch
+
+proc getData(): Future[JsonNode] {.async.} =
+  result = %*{"value": 1}
+
+type
+  MyData = object
+    value: BiggestInt
+
+proc main() {.async.} =
+  let data = to(await(getData()), MyData)
+  echo data
+
+waitFor(main())