From d9cf68e53c3067b1df92e9520b865063efad8fd5 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Thu, 21 May 2026 23:07:42 +0800
Subject: [PATCH] fixes #18238; Nested object construction can zero same memory
 multiple times

---
 compiler/ccgexprs.nim | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/ccgexprs.nim b/compiler/ccgexprs.nim
index 2cf187e687..8992edd48f 100644
--- a/compiler/ccgexprs.nim
+++ b/compiler/ccgexprs.nim
@@ -1904,7 +1904,9 @@ proc genObjConstr(p: BProc, e: PNode, d: var TLoc) =
 
   var tmp: TLoc = default(TLoc)
   var r: Rope
-  let needsZeroMem = p.config.selectedGC notin {gcArc, gcAtomicArc, gcOrc, gcYrc} or nfAllFieldsSet notin e.flags
+  let needsZeroMem =
+    nfAllFieldsSet notin e.flags or
+    (optSeqDestructors notin p.config.globalOptions and containsGarbageCollectedRef(t))
   if useTemp:
     tmp = getTemp(p, t)
     r = rdLoc(tmp)