compatibility with Nim 1.4+ (#3888)

beacon_chain/beacon_chain_db.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[typetraits, tables],

beacon_chain/beacon_chain_db_immutable.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   ./spec/datatypes/[base, altair, bellatrix],

beacon_chain/beacon_chain_db_light_client.nim

@@ -5,7 +5,11 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
+
 
 # This implements the pre-release proposal of the libp2p based light client sync
 # protocol. See https://github.com/ethereum/consensus-specs/pull/2802

beacon_chain/beacon_clock.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/math,

beacon_chain/beacon_node_light_client.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # This implements the pre-release proposal of the libp2p based light client sync
 # protocol. See https://github.com/ethereum/consensus-specs/pull/2802

beacon_chain/beacon_node_status.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 type
   # "state" is already taken by BeaconState

beacon_chain/conf.nim

@@ -5,7 +5,11 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
+
 
 import
   std/[strutils, os, options, unicode, uri],

beacon_chain/conf_light_client.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # This implements the pre-release proposal of the libp2p based light client sync
 # protocol. See https://github.com/ethereum/consensus-specs/pull/2802

beacon_chain/consensus_object_pools/attestation_pool.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard libraries

beacon_chain/consensus_object_pools/block_clearance.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronicles,

beacon_chain/consensus_object_pools/block_clearance_light_client.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[deques, math],

beacon_chain/consensus_object_pools/block_dag.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/options,

beacon_chain/consensus_object_pools/block_pools_types.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard library

beacon_chain/consensus_object_pools/block_pools_types_light_client.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # This implements the pre-release proposal of the libp2p based light client sync
 # protocol. See https://github.com/ethereum/consensus-specs/pull/2802

beacon_chain/consensus_object_pools/block_quarantine.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[tables],

beacon_chain/consensus_object_pools/blockchain_dag.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[algorithm, options, sequtils, tables, sets],

beacon_chain/consensus_object_pools/blockchain_dag_light_client.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # This implements the pre-release proposal of the libp2p based light client sync
 # protocol. See https://github.com/ethereum/consensus-specs/pull/2802

beacon_chain/consensus_object_pools/consensus_manager.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronicles, chronos,

beacon_chain/consensus_object_pools/exit_pool.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard libraries

beacon_chain/consensus_object_pools/light_client_pool.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # This implements the pre-release proposal of the libp2p based light client sync
 # protocol. See https://github.com/ethereum/consensus-specs/pull/2802

beacon_chain/consensus_object_pools/spec_cache.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/sequtils,

beacon_chain/consensus_object_pools/sync_committee_msg_pool.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[sets, tables],

beacon_chain/consensus_object_pools/vanity_logs/pandas.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import chronicles
 

beacon_chain/deposits.nim

@@ -4,7 +4,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[os, sequtils, times],

beacon_chain/eth1/deposit_contract.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   os, sequtils, strutils, options, json, terminal,

beacon_chain/eth1/eth1_monitor.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[deques, options, strformat, strutils, sequtils, tables,

beacon_chain/eth1/merkle_minimal.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/tests/core/pyspec/eth2spec/utils/merkle_minimal.py
 

beacon_chain/extras.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # Temporary dumping ground for extra types and helpers that could make it into
 # the spec potentially

beacon_chain/filepath.nim

@@ -5,7 +5,11 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
+
 
 import chronicles
 import stew/io2

beacon_chain/fork_choice/fork_choice.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard library

beacon_chain/fork_choice/fork_choice_types.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard library

beacon_chain/fork_choice/proto_array.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard library

beacon_chain/gossip_processing/batch_validation.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2019-2021 Status Research & Development GmbH
+# Copyright (c) 2019-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[deques, sequtils],

beacon_chain/gossip_processing/block_processor.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   stew/results,

beacon_chain/gossip_processing/eth2_processor.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # References to `vFuture` refer to the pre-release proposal of the libp2p based
 # light client sync protocol. Conflicting release versions are not in use.

beacon_chain/gossip_processing/gossip_validation.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # References to `vFuture` refer to the pre-release proposal of the libp2p based
 # light client sync protocol. Conflicting release versions are not in use.

beacon_chain/gossip_processing/light_client_processor.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   stew/objects,

beacon_chain/interop.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   stew/endians2, stint,

beacon_chain/light_client.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # This implements the pre-release proposal of the libp2p based light client sync
 # protocol. See https://github.com/ethereum/consensus-specs/pull/2802

beacon_chain/networking/eth2_discovery.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[os, strutils],

beacon_chain/networking/eth2_network.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Std lib

beacon_chain/networking/libp2p_json_serialization.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import libp2p/[peerid, multiaddress], json_serialization
 export json_serialization

beacon_chain/networking/network_metadata.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[sequtils, strutils, os],

beacon_chain/networking/peer_pool.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import std/[tables, heapqueue]
 import chronos

beacon_chain/networking/peer_scores.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 const
   NewPeerScore* = 300

beacon_chain/nimbus_beacon_node.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[os, random, sequtils, terminal, times],

beacon_chain/nimbus_binary_common.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # Common routines for a BeaconNode and a ValidatorClient
 

beacon_chain/rpc/rest_api.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 ## The `rest_api` module is a server implementation for the common REST API for
 ## Ethereum 2 found at https://ethereum.github.io/eth2.0-APIs/#

beacon_chain/rpc/rest_constants.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   ../spec/beacon_time

beacon_chain/rpc/rest_event_api.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   stew/results,

beacon_chain/rpc/rest_light_client_api.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import chronicles
 import ../beacon_node,

beacon_chain/rpc/rest_utils.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import std/[options, macros],
        stew/byteutils, presto,

beacon_chain/spec/beacon_time.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # References to `vFuture` refer to the pre-release proposal of the libp2p based
 # light client sync protocol. Conflicting release versions are not in use.

beacon_chain/spec/beaconstate.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[algorithm, collections/heapqueue, math, options, sequtils, tables],

beacon_chain/spec/block_id.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronicles,

beacon_chain/spec/crypto.nim

@@ -21,7 +21,10 @@
 # A, B and C, and another with B, C and D, we cannot practically combine them
 # even if in theory it is possible to allow this in BLS.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard library

beacon_chain/spec/datatypes/altair.nim

@@ -13,7 +13,10 @@
 #      https://github.com/nim-lang/RFCs/issues/250
 {.experimental: "notnil".}
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # References to `vFuture` refer to the pre-release proposal of the libp2p based
 # light client sync protocol. Conflicting release versions are not in use.

beacon_chain/spec/datatypes/base.nim

@@ -58,7 +58,10 @@
 #      https://github.com/nim-lang/RFCs/issues/250
 {.experimental: "notnil".}
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[macros, hashes, sets, strutils, tables, typetraits],

beacon_chain/spec/datatypes/bellatrix.nim

@@ -13,7 +13,10 @@
 #      https://github.com/nim-lang/RFCs/issues/250
 {.experimental: "notnil".}
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   stew/byteutils,

beacon_chain/spec/datatypes/phase0.nim

@@ -13,7 +13,10 @@
 #      https://github.com/nim-lang/RFCs/issues/250
 {.experimental: "notnil".}
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronicles,

beacon_chain/spec/digest.nim

@@ -19,7 +19,10 @@
 # (already did Blake2b --> Keccak256 --> SHA2-256),
 # we call this function `eth2digest`, and it outputs a `Eth2Digest`. Easy to sed :)
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard library

beacon_chain/spec/engine_authentication.nim

@@ -14,7 +14,10 @@ import
 
 export rand, results
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 proc base64urlEncode(x: auto): string =
   # The only strings this gets are internally generated, and don't have

beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim

@@ -138,7 +138,10 @@ type
     GetPhase0StateSszResponse |
     GetPhase0BlockSszResponse
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 proc writeValue*(writer: var JsonWriter[RestJson],
                  epochFlags: EpochParticipationFlags)

beacon_chain/spec/eth2_apis/rest_beacon_calls.nim

@@ -4,7 +4,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client, chronicles,

beacon_chain/spec/eth2_apis/rest_beacon_client.nim

@@ -1,10 +1,13 @@
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client,

beacon_chain/spec/eth2_apis/rest_common.nim

@@ -4,7 +4,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client, chronicles,

beacon_chain/spec/eth2_apis/rest_config_calls.nim

@@ -1,10 +1,13 @@
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client,

beacon_chain/spec/eth2_apis/rest_debug_calls.nim

@@ -4,7 +4,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client,

beacon_chain/spec/eth2_apis/rest_keymanager_calls.nim

@@ -4,7 +4,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client, chronicles,

beacon_chain/spec/eth2_apis/rest_node_calls.nim

@@ -1,10 +1,13 @@
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client,

beacon_chain/spec/eth2_apis/rest_remote_signer_calls.nim

@@ -4,7 +4,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/strutils, chronicles, metrics,

beacon_chain/spec/eth2_apis/rest_types.nim

@@ -11,7 +11,10 @@
 # in the API which may lead to incompatibilities between clients - tread
 # carefully!
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/json,

beacon_chain/spec/eth2_apis/rest_validator_calls.nim

@@ -1,10 +1,13 @@
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client,

beacon_chain/spec/eth2_merkleization.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # Import this module to get access to `hash_tree_root` for spec types
 

beacon_chain/spec/eth2_ssz_serialization.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # This module exports SSZ.encode and SSZ.decode for spec types - don't use
 # ssz_serialization directly! To bypass root updates, use `readSszBytes`

beacon_chain/spec/forks.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   stew/assign2,

beacon_chain/spec/helpers.nim

@@ -7,7 +7,10 @@
 
 # Uncategorized helper functions from the spec
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # References to `vFuture` refer to the pre-release proposal of the libp2p based
 # light client sync protocol. Conflicting release versions are not in use.

beacon_chain/spec/keystore.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   # Standard library

beacon_chain/spec/light_client_sync.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # References to `vFuture` refer to the pre-release proposal of the libp2p based
 # light client sync protocol. Conflicting release versions are not in use.

beacon_chain/spec/mev/bellatrix_mev.nim

@@ -7,7 +7,10 @@
 
 import ".."/datatypes/[altair, bellatrix]
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 type
   # https://github.com/ethereum/builder-specs/blob/v0.2.0/specs/builder.md#validatorregistrationv1

beacon_chain/spec/mev/rest_bellatrix_mev_calls.nim

@@ -4,7 +4,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos, presto/client,

beacon_chain/spec/network.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # References to `vFuture` refer to the pre-release proposal of the libp2p based
 # light client sync protocol. Conflicting release versions are not in use.

beacon_chain/spec/presets.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[macros, strutils, parseutils, tables],

beacon_chain/spec/signatures.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 ## Signature production and verification for spec types - for every type of
 ## signature, there are 3 functions:

beacon_chain/spec/signatures_batch.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 ## This module contains signature verification helpers corresponding to those
 ## in signatures.nim, for use with signature sets / batch signature verification

beacon_chain/spec/ssz_codec.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 {.pragma: raisesssz, raises: [Defect, MalformedSszError, SszSizeMismatchError].}
 
 import

beacon_chain/spec/state_transition.nim

@@ -38,7 +38,10 @@
 #   overload is used, the hash tree cache is cleared, which, aside from being
 #   slow itself, causes additional processing to recalculate the merkle tree.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronicles,

beacon_chain/spec/state_transition_block.nim

@@ -17,7 +17,10 @@
 #   improvements to be made - other than that, keep things similar to spec unless
 #   motivated by security or performance considerations
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[algorithm, options, sequtils, sets, tables],

beacon_chain/spec/state_transition_epoch.nim

@@ -18,7 +18,10 @@
 #   improvements to be made - other than that, keep things similar to spec unless
 #   motivated by security or performance considerations
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[algorithm, math],

beacon_chain/spec/validator.nim

@@ -6,7 +6,10 @@
 
 # Helpers and functions pertaining to managing the validator set
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[options, math, tables],

beacon_chain/spec/weak_subjectivity.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   ./datatypes/base, ./forks, ./helpers

beacon_chain/sszdump.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[os, strformat],

beacon_chain/statediff.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2020-2021 Status Research & Development GmbH
+# Copyright (c) 2020-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   stew/assign2,

beacon_chain/statusbar.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   std/[strutils, parseutils, sequtils, terminal, colors]

beacon_chain/sync/light_client_manager.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # This implements the pre-release proposal of the libp2p based light client sync
 # protocol. See https://github.com/ethereum/consensus-specs/pull/2802

beacon_chain/sync/optimistic_sync_light_client.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import
   chronos,

beacon_chain/sync/request_manager.nim

@@ -1,11 +1,14 @@
 # beacon_chain
-# Copyright (c) 2018-2021 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import std/[sequtils, strutils]
 import chronos, chronicles

beacon_chain/sync/sync_manager.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import std/[options, heapqueue, tables, strutils, sequtils, algorithm]
 import stew/[results, base10], chronos, chronicles

beacon_chain/sync/sync_protocol.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 # References to `vFuture` refer to the pre-release proposal of the libp2p based
 # light client sync protocol. Conflicting release versions are not in use.

beacon_chain/sync/sync_queue.nim

@@ -5,7 +5,10 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-{.push raises: [Defect].}
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
 
 import std/[options, heapqueue, tables, strutils, sequtils, math]
 import stew/[results, base10], chronos, chronicles