fix #13093

Author: bung87

lib/pure/concurrency/atomics.nim

@@ -89,7 +89,7 @@ when defined(cpp) or defined(nimdoc):
         ## with other moSequentiallyConsistent operations.
 
   type
-    Atomic*[T] {.importcpp: "std::atomic", completeStruct.} = object
+    Atomic*[T] {.importcpp: "std::atomic", completeStruct, requiresInit.} = object
       ## An atomic object with underlying type `T`.
       raw: T
 

tests/cpp/t13093.nim

@@ -0,0 +1,24 @@
+discard """
+  targets: "cpp"
+  action: reject
+  errormsg: "The PledgeObj type requires the following fields to be initialized: refCount"
+"""
+
+import atomics
+
+type
+  Pledge* = object
+    p: PledgePtr
+
+  PledgePtr = ptr PledgeObj
+  PledgeObj = object
+    refCount: Atomic[int32]
+
+proc main() =
+  var pledge: Pledge
+  pledge.p = createShared(PledgeObj)
+  let tmp = PledgeObj() # <---- not allowed: atomics are not copyable
+
+  pledge.p[] = tmp
+
+main()