this derivation will be built:
  /nix/store/8fz0krwp8q5bhxck3wnlh0dpj2x1n6wv-treefmt-check.drv
building '/nix/store/8fz0krwp8q5bhxck3wnlh0dpj2x1n6wv-treefmt-check.drv'
treefmt-check> treefmt v2.5.0traversed 67 files
treefmt-check> emitted 64 files for processing
treefmt-check> formatted 64 files (3 changed) in 411ms
treefmt-check>  M clanServices/dvt/roles/ecl/adapters.unit.nix
treefmt-check>  M clanServices/dvt/roles/ecl/lighthouse.nix
treefmt-check>  M clanServices/dvt/tests/lib.nix
treefmt-check> diff --git a/clanServices/dvt/roles/ecl/adapters.unit.nix b/clanServices/dvt/roles/ecl/adapters.unit.nix
treefmt-check> index d5f499f..14bb95e 100644
treefmt-check> --- a/clanServices/dvt/roles/ecl/adapters.unit.nix
treefmt-check> +++ b/clanServices/dvt/roles/ecl/adapters.unit.nix
treefmt-check> @@ -52,7 +52,8 @@ let
treefmt-check>    nethermindFor =
treefmt-check>      overrides: (evalAdapter ./nethermind.nix (mkSettings overrides)).services.nethermind.test;
treefmt-check>    lighthouseFor =
treefmt-check> -    overrides: (evalAdapter ./lighthouse.nix (mkSettings overrides)).services.ethereum.lighthouse-beacon.test;
treefmt-check> +    overrides:
treefmt-check> +    (evalAdapter ./lighthouse.nix (mkSettings overrides)).services.ethereum.lighthouse-beacon.test;
treefmt-check>  in
treefmt-check>  {
treefmt-check>    teku = {
treefmt-check> @@ -193,17 +194,19 @@ in
treefmt-check>      };
treefmt-check>  
treefmt-check>      "test checkpointSyncUrl is passed through from the clan service" = {
treefmt-check> -      expr = builtins.elem "--checkpoint-sync-url=https://checkpoint.example" (
treefmt-check> -        lighthouseFor {
treefmt-check> -          network = "hoodi";
treefmt-check> -          beacon.checkpointSyncUrl = "https://checkpoint.example";
treefmt-check> -        }
treefmt-check> -      ).extraArgs;
treefmt-check> +      expr =
treefmt-check> +        builtins.elem "--checkpoint-sync-url=https://checkpoint.example"
treefmt-check> +          (lighthouseFor {
treefmt-check> +            network = "hoodi";
treefmt-check> +            beacon.checkpointSyncUrl = "https://checkpoint.example";
treefmt-check> +          }).extraArgs;
treefmt-check>        expected = true;
treefmt-check>      };
treefmt-check>  
treefmt-check>      "test unset checkpointSyncUrl adds no checkpoint flag to extraArgs" = {
treefmt-check> -      expr = builtins.any (lib.hasPrefix "--checkpoint-sync-url") (lighthouseFor { network = "hoodi"; }).extraArgs;
treefmt-check> +      expr =
treefmt-check> +        builtins.any (lib.hasPrefix "--checkpoint-sync-url")
treefmt-check> +          (lighthouseFor { network = "hoodi"; }).extraArgs;
treefmt-check>        expected = false;
treefmt-check>      };
treefmt-check>    };
treefmt-check> diff --git a/clanServices/dvt/roles/ecl/lighthouse.nix b/clanServices/dvt/roles/ecl/lighthouse.nix
treefmt-check> index ba0fad6..8a10d3c 100644
treefmt-check> --- a/clanServices/dvt/roles/ecl/lighthouse.nix
treefmt-check> +++ b/clanServices/dvt/roles/ecl/lighthouse.nix
treefmt-check> @@ -32,7 +32,7 @@ in
treefmt-check>        http = {
treefmt-check>          enable = true;
treefmt-check>          address = "::";
treefmt-check> -        port = settings.beacon.rest.port;
treefmt-check> +        inherit (settings.beacon.rest) port;
treefmt-check>        };
treefmt-check>  
treefmt-check>        metrics = {
treefmt-check> @@ -41,22 +41,21 @@ in
treefmt-check>        };
treefmt-check>      };
treefmt-check>  
treefmt-check> -    extraArgs =
treefmt-check> -      [
treefmt-check> -        "--port=${toString settings.beacon.p2p.port}"
treefmt-check> -        "--subscribe-all-subnets"
treefmt-check> -      ]
treefmt-check> -      ++ lib.optionals (settings.beacon.p2p.maxPeers != null) [
treefmt-check> -        "--target-peers=${toString settings.beacon.p2p.maxPeers}"
treefmt-check> -      ]
treefmt-check> -      ++ lib.optionals
treefmt-check> -        (settings.beacon.p2p.nat != null && lib.hasPrefix "extip:" settings.beacon.p2p.nat)
treefmt-check> +    extraArgs = [
treefmt-check> +      "--port=${toString settings.beacon.p2p.port}"
treefmt-check> +      "--subscribe-all-subnets"
treefmt-check> +    ]
treefmt-check> +    ++ lib.optionals (settings.beacon.p2p.maxPeers != null) [
treefmt-check> +      "--target-peers=${toString settings.beacon.p2p.maxPeers}"
treefmt-check> +    ]
treefmt-check> +    ++
treefmt-check> +      lib.optionals (settings.beacon.p2p.nat != null && lib.hasPrefix "extip:" settings.beacon.p2p.nat)
treefmt-check>          [
treefmt-check>            "--enr-address=${lib.removePrefix "extip:" settings.beacon.p2p.nat}"
treefmt-check>          ]
treefmt-check> -      ++ lib.optionals (settings.beacon.checkpointSyncUrl != null) [
treefmt-check> -        "--checkpoint-sync-url=${settings.beacon.checkpointSyncUrl}"
treefmt-check> -      ];
treefmt-check> +    ++ lib.optionals (settings.beacon.checkpointSyncUrl != null) [
treefmt-check> +      "--checkpoint-sync-url=${settings.beacon.checkpointSyncUrl}"
treefmt-check> +    ];
treefmt-check>    };
treefmt-check>  
treefmt-check>    environment.etc."alloy/dvt-lighthouse-beacon.alloy".text = ''
treefmt-check> diff --git a/clanServices/dvt/tests/lib.nix b/clanServices/dvt/tests/lib.nix
treefmt-check> index 4d6a02b..980996c 100644
treefmt-check> --- a/clanServices/dvt/tests/lib.nix
treefmt-check> +++ b/clanServices/dvt/tests/lib.nix
treefmt-check> @@ -925,7 +925,8 @@ in
treefmt-check>                # is /ip4/203.0.113.7/tcp/9000 for every entry (all ECL nodes share this
treefmt-check>                # test NAT IP), which is unreachable inside the QEMU VM network — actual CL
treefmt-check>                # inter-node peering does not occur. Each node starts with a stable identity.
treefmt-check> -              settings.beacon.p2p.staticPeers = clPackage != "nimbus" && clPackage != "lodestar" && clPackage != "lighthouse";
treefmt-check> +              settings.beacon.p2p.staticPeers =
treefmt-check> +                clPackage != "nimbus" && clPackage != "lodestar" && clPackage != "lighthouse";
treefmt-check>                settings.beacon.p2p.directPeering = clPackage == "lodestar";
treefmt-check>                # Port must match the chosen CL client's REST API port
treefmt-check>                settings.beacon.rest.port = cl.restPortInventorySetting;
error: Cannot build '/nix/store/8fz0krwp8q5bhxck3wnlh0dpj2x1n6wv-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/9wijf57d98qqznlrybcxabr5gz1p2c41-treefmt-check
       Last 25 log lines:
       >            "--enr-address=${lib.removePrefix "extip:" settings.beacon.p2p.nat}"
       >          ]
       > -      ++ lib.optionals (settings.beacon.checkpointSyncUrl != null) [
       > -        "--checkpoint-sync-url=${settings.beacon.checkpointSyncUrl}"
       > -      ];
       > +    ++ lib.optionals (settings.beacon.checkpointSyncUrl != null) [
       > +      "--checkpoint-sync-url=${settings.beacon.checkpointSyncUrl}"
       > +    ];
       >    };
       >  
       >    environment.etc."alloy/dvt-lighthouse-beacon.alloy".text = ''
       > diff --git a/clanServices/dvt/tests/lib.nix b/clanServices/dvt/tests/lib.nix
       > index 4d6a02b..980996c 100644
       > --- a/clanServices/dvt/tests/lib.nix
       > +++ b/clanServices/dvt/tests/lib.nix
       > @@ -925,7 +925,8 @@ in
       >                # is /ip4/203.0.113.7/tcp/9000 for every entry (all ECL nodes share this
       >                # test NAT IP), which is unreachable inside the QEMU VM network — actual CL
       >                # inter-node peering does not occur. Each node starts with a stable identity.
       > -              settings.beacon.p2p.staticPeers = clPackage != "nimbus" && clPackage != "lodestar" && clPackage != "lighthouse";
       > +              settings.beacon.p2p.staticPeers =
       > +                clPackage != "nimbus" && clPackage != "lodestar" && clPackage != "lighthouse";
       >                settings.beacon.p2p.directPeering = clPackage == "lodestar";
       >                # Port must match the chosen CL client's REST API port
       >                settings.beacon.rest.port = cl.restPortInventorySetting;
       For full logs, run:
         nix log /nix/store/8fz0krwp8q5bhxck3wnlh0dpj2x1n6wv-treefmt-check.drv