fixes #13105 (#13138)

compiler/ccgexprs.nim

@@ -336,7 +336,7 @@ proc genAssignment(p: BProc, dest, src: TLoc, flags: TAssignmentFlags) =
     else:
       linefmt(p, cpsStmts, "$1 = $2;$n", [rdLoc(dest), rdLoc(src)])
   of tyArray:
-    if containsGarbageCollectedRef(dest.t):
+    if containsGarbageCollectedRef(dest.t) and p.config.selectedGC notin {gcArc, gcOrc, gcHooks}:
       genGenericAsgn(p, dest, src, flags)
     else:
       linefmt(p, cpsStmts,

tests/destructor/tarc.nim

@@ -4,6 +4,8 @@ discard """
 Success
 @["a", "b", "c"]
 Hello
+1
+2
 0'''
   cmd: '''nim c --gc:arc $file'''
 """
@@ -126,4 +128,20 @@ proc bug13119 =
 
 bug13119()
 
+# bug #13105
+
+type
+  Result[T, E] = object
+    a: T
+    b: E
+  D = ref object
+    x: int
+  R = Result[D, int]
+
+proc bug13105 =
+  for n in [R(b: 1), R(b: 2)]:
+    echo n.b
+
+bug13105()
+
 echo getOccupiedMem() - startMem