fixes #12882 (#12889)

* fixes #12882

compiler/ccgtrav.nim

@@ -99,7 +99,7 @@ proc genTraverseProc(c: TTraversalClosure, accessor: Rope, typ: PType) =
   of tyRef:
     lineCg(p, cpsStmts, visitorFrmt, [accessor, c.visitorFrmt])
   of tySequence:
-    if tfHasAsgn notin typ.flags:
+    if optSeqDestructors notin c.p.module.config.globalOptions:
       lineCg(p, cpsStmts, visitorFrmt, [accessor, c.visitorFrmt])
     elif containsGarbageCollectedRef(typ.lastSon):
       # destructor based seqs are themselves not traced but their data is, if

tests/destructor/tatomicptrs.nim

@@ -147,3 +147,21 @@ proc newMySeq*[T](size: int, initial_value: T): MySeq[T] =
 
 let x = makeShared(newMySeq(10, 1.0))
 doAssert: x.get().len == 10
+
+
+
+#-------------------------------------------------------
+#bug #12882
+
+type
+  ValueObject = object
+    v: MySeq[int]
+    name: string
+
+  TopObject = object
+    internal: seq[ValueObject]
+
+var zz = new(TopObject)
+
+
+