From c86f9590fb5ba6512ba33994fa0711341eb8524b Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Tue, 27 Jul 2021 12:48:27 +0200
Subject: [PATCH] fixes #18570 (#18599)

---
 compiler/injectdestructors.nim | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/compiler/injectdestructors.nim b/compiler/injectdestructors.nim
index cf09b3ff5b..985f278784 100644
--- a/compiler/injectdestructors.nim
+++ b/compiler/injectdestructors.nim
@@ -799,7 +799,8 @@ proc p(n: PNode; c: var Con; s: var Scope; mode: ProcessMode): PNode =
           result[i] = p(n[i], c, s, m)
     of nkObjConstr:
       # see also the remark about `nkTupleConstr`.
-      let isRefConstr = n.typ.skipTypes(abstractInst).kind == tyRef
+      let t = n.typ.skipTypes(abstractInst)
+      let isRefConstr = t.kind == tyRef
       let m = if isRefConstr: sinkArg
               elif mode == normal: normal
               else: sinkArg
@@ -807,7 +808,7 @@ proc p(n: PNode; c: var Con; s: var Scope; mode: ProcessMode): PNode =
       result = copyTree(n)
       for i in 1..<n.len:
         if n[i].kind == nkExprColonExpr:
-          let field = lookupFieldAgain(n.typ, n[i][0].sym)
+          let field = lookupFieldAgain(t, n[i][0].sym)
           if field != nil and sfCursor in field.flags:
             result[i][1] = p(n[i][1], c, s, normal)
           else: