sure! it's the vscode remote plugin's flake this time, but I'm getting the warning from 25 more things:

:;    env NIX_ABORT_ON_WARN=1 nix build --impure --show-trace --no-link .#darwinConfigurations.glyn.config.system.build.toplevel
trace: evaluation warning: Nixpkgs 26.05 will be the last release to support x86_64-darwin; see https://nixos.org/manual/nixpkgs/unstable/release-notes#x86_64-darwin-26.05
error:
       … while evaluating an expression to select 'drvPath' on it
         at «internal»:1:552:
       … while evaluating strict
         at «internal»:1:552:
       … while calling the 'derivationStrict' builtin
         at «internal»:1:208:
       … while evaluating derivation 'darwin-system-26.05.52d0615'
         whose name attribute is located at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/pkgs/stdenv/generic/make-derivation.nix:536:13
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/pkgs/stdenv/generic/make-derivation.nix:536:13:
          535|           // {
          536|             ${if (attrs ? name || (attrs ? pname && attrs ? version)) then "name" else null} =
             |             ^
          537|               let

       … while evaluating attribute 'buildCommand' of derivation 'darwin-system-26.05.52d0615'
         at /nix/store/5rc49v3d3zi0ixprl36djg5cjl8kq93r-source/modules/system/default.nix:143:7:
          142|
          143|       buildCommand = ''
             |       ^
          144|         mkdir $out

       … while calling the 'getAttr' builtin
         at «internal»:1:500:
       … while calling the 'derivationStrict' builtin
         at «internal»:1:208:
       … while evaluating derivation 'etc'
         whose name attribute is located at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/pkgs/stdenv/generic/make-derivation.nix:536:13
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/pkgs/stdenv/generic/make-derivation.nix:536:13:
          535|           // {
          536|             ${if (attrs ? name || (attrs ? pname && attrs ? version)) then "name" else null} =
             |             ^
          537|               let

       … while evaluating attribute 'buildCommand' of derivation 'etc'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/pkgs/build-support/trivial-builders/default.nix:80:17:
           79|         enableParallelBuilding = true;
           80|         inherit buildCommand name;
             |                 ^
           81|         passAsFile = [ "buildCommand" ] ++ (derivationArgs.passAsFile or [ ]);

       … from call site
         at /nix/store/5rc49v3d3zi0ixprl36djg5cjl8kq93r-source/modules/system/etc.nix:36:11:
           35|         cd $out/etc
           36|         ${concatMapStringsSep "\n" (attr: ''
             |           ^
           37|           mkdir -p "$(dirname ${escapeShellArg attr.target})"

       … while calling 'concatMapStringsSep'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/strings.nix:262:13:
          261|   concatMapStringsSep =
          262|     sep: f: list:
             |             ^
          263|     concatStringsSep sep (map f list);

       … while calling the 'concatStringsSep' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/strings.nix:263:5:
          262|     sep: f: list:
          263|     concatStringsSep sep (map f list);
             |     ^
          264|

       … while calling anonymous lambda
         at /nix/store/5rc49v3d3zi0ixprl36djg5cjl8kq93r-source/modules/system/etc.nix:36:37:
           35|         cd $out/etc
           36|         ${concatMapStringsSep "\n" (attr: ''
             |                                     ^
           37|           mkdir -p "$(dirname ${escapeShellArg attr.target})"

       … from call site
         at /nix/store/5rc49v3d3zi0ixprl36djg5cjl8kq93r-source/modules/system/etc.nix:38:19:
           37|           mkdir -p "$(dirname ${escapeShellArg attr.target})"
           38|           ln -s ${escapeShellArgs [ attr.source attr.target ]}
             |                   ^
           39|         '') etc}

       … while calling 'concatMapStringsSep'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/strings.nix:262:13:
          261|   concatMapStringsSep =
          262|     sep: f: list:
             |             ^
          263|     concatStringsSep sep (map f list);

       … while calling the 'concatStringsSep' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/strings.nix:263:5:
          262|     sep: f: list:
          263|     concatStringsSep sep (map f list);
             |     ^
          264|

       … while calling 'escapeShellArg'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/strings.nix:1202:5:
         1201|   escapeShellArg =
         1202|     arg:
             |     ^
         1203|     let

       … while calling the 'match' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/strings.nix:1206:8:
         1205|     in
         1206|     if match "[[:alnum:],._+:@%/-]+" string == null then
             |        ^
         1207|       "'${replaceString "'" "'\\''" string}'"

       … while evaluating the second argument passed to builtins.match

       … while calling the 'toString' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/strings.nix:1204:16:
         1203|     let
         1204|       string = toString arg;
             |                ^
         1205|     in

       … from call site
         at /nix/store/5rc49v3d3zi0ixprl36djg5cjl8kq93r-source/modules/system/etc.nix:38:42:
           37|           mkdir -p "$(dirname ${escapeShellArg attr.target})"
           38|           ln -s ${escapeShellArgs [ attr.source attr.target ]}
             |                                          ^
           39|         '') etc}

       … while calling anonymous lambda
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/attrsets.nix:1187:17:
         1186|         mapAttrs (
         1187|           name: value:
             |                 ^
         1188|           if isAttrs value && cond value then recurse (path ++ [ name ]) value else f (path ++ [ name ]) value

       … from call site
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/attrsets.nix:1188:85:
         1187|           name: value:
         1188|           if isAttrs value && cond value then recurse (path ++ [ name ]) value else f (path ++ [ name ]) value
             |                                                                                     ^
         1189|         );

       … while calling anonymous lambda
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:283:71:
          282|           # For definitions that have an associated option
          283|           declaredConfig = mapAttrsRecursiveCond (v: !isOption v) (_: v: v.value) options;
             |                                                                       ^
          284|

       … while evaluating the attribute 'value'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1159:7:
         1158|     // {
         1159|       value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |       ^
         1160|       inherit (res.defsFinal') highestPrio;

       … while calling the 'addErrorContext' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1159:15:
         1158|     // {
         1159|       value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |               ^
         1160|       inherit (res.defsFinal') highestPrio;

       … while evaluating the option `environment.etc."nix/inputs/nixos-vscode-server".source':

       … while evaluating the attribute 'mergedValue'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1233:5:
         1232|     # Type-check the remaining definitions, and merge them. Or throw if no definitions.
         1233|     mergedValue =
             |     ^
         1234|       if isDefined then

       … while evaluating isDefined
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1234:10:
         1233|     mergedValue =
         1234|       if isDefined then
             |          ^
         1235|         if type.merge ? v2 then

       … while evaluating defsFinal
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1295:17:
         1294|
         1295|     isDefined = defsFinal != [ ];
             |                 ^
         1296|

       … while evaluating the attribute 'values'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1227:9:
         1226|       {
         1227|         values = defsSorted;
             |         ^
         1228|         inherit (defsFiltered) highestPrio;

       … while calling the 'any' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1221:14:
         1220|           # Avoid sorting if we don't have to.
         1221|           if any (def: def.value._type or "" == "order") defsFiltered.values then
             |              ^
         1222|             sortProperties defsFiltered.values

       … while evaluating the attribute 'values'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1401:7:
         1400|     {
         1401|       values = concatMap (def: if getPrio def == highestPrio then [ (strip def) ] else [ ]) defs;
             |       ^
         1402|       inherit highestPrio;

       … while calling the 'concatMap' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1401:16:
         1400|     {
         1401|       values = concatMap (def: if getPrio def == highestPrio then [ (strip def) ] else [ ]) defs;
             |                ^
         1402|       inherit highestPrio;

       … while calling the 'concatMap' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1201:26:
         1200|         # Process mkMerge and mkIf properties.
         1201|         defsNormalized = concatMap (
             |                          ^
         1202|           m:

       … while calling anonymous lambda
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1202:11:
         1201|         defsNormalized = concatMap (
         1202|           m:
             |           ^
         1203|           map (

       … while calling the 'map' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1203:11:
         1202|           m:
         1203|           map (
             |           ^
         1204|             value:

       … while calling the 'addErrorContext' builtin
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1212:14:
         1211|               }
         1212|           ) (addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |              ^
         1213|         ) defs;

       … while evaluating definitions from `<unknown-file>':

       … from call site
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1212:80:
         1211|               }
         1212|           ) (addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                ^
         1213|         ) defs;

       … while calling 'dischargeProperties'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1352:5:
         1351|   dischargeProperties =
         1352|     def:
             |     ^
         1353|     if def._type or "" == "merge" then

       … while evaluating an expression to select '_type' on it
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1353:8:
         1352|     def:
         1353|     if def._type or "" == "merge" then
             |        ^
         1354|       concatMap dischargeProperties def.contents

       … while evaluating def
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:1353:8:
         1352|     def:
         1353|     if def._type or "" == "merge" then
             |        ^
         1354|       concatMap dischargeProperties def.contents

       … while evaluating the attribute 'value'
         at /nix/store/az8lhj92ggbhkvkssl3ahf4c9d387h2g-source/lib/modules.nix:846:21:
          845|             inherit (module) file;
          846|             inherit value;
             |                     ^
          847|           }) module.config

       … while evaluating an expression to select 'outPath' on it
         at /nix/store/6aw71kqpkvkfr8mz3f37lxggyr9fahfs-source/machine/flake-part.nix:77:28:
           76|             name = "nix/inputs/${name}";
           77|             value.source = flake.outPath;
             |                            ^
           78|           }) (inputs // { nixpkgs = nixpkgs; });

       … while evaluating flake
         at /nix/store/6aw71kqpkvkfr8mz3f37lxggyr9fahfs-source/machine/flake-part.nix:77:28:
           76|             name = "nix/inputs/${name}";
           77|             value.source = flake.outPath;
             |                            ^
           78|           }) (inputs // { nixpkgs = nixpkgs; });

       … from call site
         at /nix/store/6aw71kqpkvkfr8mz3f37lxggyr9fahfs-source/machine/flake-part.nix:77:28:
           76|             name = "nix/inputs/${name}";
           77|             value.source = flake.outPath;
             |                            ^
           78|           }) (inputs // { nixpkgs = nixpkgs; });

       … while calling anonymous lambda
         at «string»:24:46:
           23|
           24|       inputs = builtins.mapAttrs (inputName: inputSpec: allNodes.${resolveInput inputSpec}) (
             |                                              ^
           25|         node.inputs or { }

       … from call site
         at «string»:24:66:
           23|
           24|       inputs = builtins.mapAttrs (inputName: inputSpec: allNodes.${resolveInput inputSpec}) (
             |                                                                  ^
           25|         node.inputs or { }

       … while calling anonymous lambda
         at «string»:9:10:
            8|   allNodes = builtins.mapAttrs (
            9|     key: node:
             |          ^
           10|     let

       … while evaluating result
         at «string»:68:7:
           67|       assert builtins.isFunction flake.outputs;
           68|       result
             |       ^
           69|     else

       … while evaluating outputs
         at «string»:49:9:
           48|       result =
           49|         outputs
             |         ^
           50|         # We add the sourceInfo attribute for its metadata, as they are

       … from call site
         at «string»:46:17:
           45|
           46|       outputs = flake.outputs (inputs // { self = result; });
             |                 ^
           47|

       … while calling 'outputs'
         at /nix/store/fk72y5m99vh5r6g2ygq70r0yp3kz8ia2-source/flake.nix:8:13:
            7|
            8|   outputs = {
             |             ^
            9|     self,

       … from call site
         at /nix/store/fk72y5m99vh5r6g2ygq70r0yp3kz8ia2-source/flake.nix:22:7:
           21|     in
           22|       eachSystem defaultSystems (system: let
             |       ^
           23|         pkgs = nixpkgs.legacyPackages.${system};

       … while calling 'eachSystemOp'
         at /nix/store/01x5k4nlxcpyd85nnr0b9gm89rm8ff4x-source/lib.nix:52:18:
           51|   eachSystemOp =
           52|     op: systems: f:
             |                  ^
           53|     builtins.foldl' (op f) { } (

       … while calling the 'foldl'' builtin
         at /nix/store/01x5k4nlxcpyd85nnr0b9gm89rm8ff4x-source/lib.nix:53:5:
           52|     op: systems: f:
           53|     builtins.foldl' (op f) { } (
             |     ^
           54|       if

       … while calling anonymous lambda
         at /nix/store/01x5k4nlxcpyd85nnr0b9gm89rm8ff4x-source/lib.nix:35:15:
           34|     # Merge outputs for each system.
           35|     f: attrs: system:
             |               ^
           36|     let

       … while calling the 'foldl'' builtin
         at /nix/store/01x5k4nlxcpyd85nnr0b9gm89rm8ff4x-source/lib.nix:39:5:
           38|     in
           39|     builtins.foldl' (
             |     ^
           40|       attrs: key:

       … while calling the 'attrNames' builtin
         at /nix/store/01x5k4nlxcpyd85nnr0b9gm89rm8ff4x-source/lib.nix:47:14:
           46|       }
           47|     ) attrs (builtins.attrNames ret)
             |              ^
           48|   );

       … from call site
         at /nix/store/01x5k4nlxcpyd85nnr0b9gm89rm8ff4x-source/lib.nix:37:13:
           36|     let
           37|       ret = f system;
             |             ^
           38|     in

       … while calling anonymous lambda
         at /nix/store/fk72y5m99vh5r6g2ygq70r0yp3kz8ia2-source/flake.nix:22:34:
           21|     in
           22|       eachSystem defaultSystems (system: let
             |                                  ^
           23|         pkgs = nixpkgs.legacyPackages.${system};

       … while evaluating optionalAttrs
         at /nix/store/fk72y5m99vh5r6g2ygq70r0yp3kz8ia2-source/flake.nix:28:9:
           27|         # The package depends on `inotify-tools` which is only available on Linux.
           28|         optionalAttrs (hasSuffix "-linux" system) {
             |         ^
           29|           packages = {

       … while evaluating an expression to select 'optionalAttrs' on it
         at /nix/store/fk72y5m99vh5r6g2ygq70r0yp3kz8ia2-source/flake.nix:24:38:
           23|         pkgs = nixpkgs.legacyPackages.${system};
           24|         inherit (pkgs.lib) hasSuffix optionalAttrs;
             |                                      ^
           25|         auto-fix-vscode-server = pkgs.callPackage ./pkgs/auto-fix-vscode-server.nix { };

       … while evaluating an expression to select 'lib' on it
         at /nix/store/fk72y5m99vh5r6g2ygq70r0yp3kz8ia2-source/flake.nix:24:18:
           23|         pkgs = nixpkgs.legacyPackages.${system};
           24|         inherit (pkgs.lib) hasSuffix optionalAttrs;
             |                  ^
           25|         auto-fix-vscode-server = pkgs.callPackage ./pkgs/auto-fix-vscode-server.nix { };

       … while evaluating pkgs
         at /nix/store/fk72y5m99vh5r6g2ygq70r0yp3kz8ia2-source/flake.nix:24:18:
           23|         pkgs = nixpkgs.legacyPackages.${system};
           24|         inherit (pkgs.lib) hasSuffix optionalAttrs;
             |                  ^
           25|         auto-fix-vscode-server = pkgs.callPackage ./pkgs/auto-fix-vscode-server.nix { };

       … while evaluating the attribute 'legacyPackages.x86_64-darwin'
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/lib/attrsets.nix:983:47:
          982|   */
          983|   nameValuePair = name: value: { inherit name value; };
             |                                               ^
          984|

       … from call site
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/lib/attrsets.nix:1344:61:
         1343|   */
         1344|   genAttrs = names: f: genAttrs' names (n: nameValuePair n (f n));
             |                                                             ^
         1345|

       … while calling anonymous lambda
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/flake.nix:223:9:
          222|       legacyPackages = forAllSystems (
          223|         system:
             |         ^
          224|         (import ./. {

       … from call site
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/flake.nix:224:10:
          223|         system:
          224|         (import ./. {
             |          ^
          225|           inherit system;

       … while calling anonymous lambda
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/pkgs/top-level/impure.nix:12:1:
           11|
           12| {
             | ^
           13|   # We put legacy `system` into `localSystem`, if `localSystem` was not passed.

       … from call site
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/pkgs/top-level/impure.nix:57:1:
           56|
           57| import ./. (
             | ^
           58|   removeAttrs args [ "system" ]

       … while calling anonymous lambda
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/pkgs/top-level/default.nix:40:1:
           39|
           40| {
             | ^
           41|   # The system packages will be built on. See the manual for the

       … while evaluating checked
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/pkgs/top-level/default.nix:220:1:
          219| in
          220| checked pkgs
             | ^
          221|

       … from call site
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/pkgs/top-level/default.nix:99:6:
           98|   checked =
           99|     (throwIfNot (lib.isList overlays) "The overlays argument to nixpkgs must be a list.")
             |      ^
          100|       (throwIfNot (lib.all lib.isFunction overlays) "All overlays passed to nixpkgs must be functions.")

       … while calling anonymous lambda
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/lib/trivial.nix:920:40:
          919|   */
          920|   throwIfNot = cond: msg: if cond then x: x else throw msg;
             |                                        ^
          921|

       … while evaluating x
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/lib/trivial.nix:920:43:
          919|   */
          920|   throwIfNot = cond: msg: if cond then x: x else throw msg;
             |                                           ^
          921|

       … while evaluating x86_64DarwinDeprecationWarning
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/pkgs/top-level/default.nix:110:11:
          109|         then
          110|           x86_64DarwinDeprecationWarning
             |           ^
          111|         else

       … from call site
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/pkgs/top-level/default.nix:33:5:
           32|   x86_64DarwinDeprecationWarning =
           33|     pristineLib.warn
             |     ^
           34|       "Nixpkgs 26.05 will be the last release to support x86_64-darwin; see https://nixos.org/manual/nixpkgs/unstable/release-notes#x86_64-darwin-26.05"

       … while calling anonymous lambda
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/lib/trivial.nix:816:12:
          815|       # Do not eta reduce v, so that we have the same strictness as `builtins.warn`.
          816|       msg: v:
             |            ^
          817|       # `builtins.warn` requires a string message, so we enforce that in our implementation, so that callers aren't accidentally incompatible with newer Nix versions.

       … while calling the 'trace' builtin
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/lib/trivial.nix:820:9:
          819|       if mustAbort then
          820|         builtins.trace "evaluation warning: ${msg}" (
             |         ^
          821|           abort "NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors."

       … while calling the 'abort' builtin
         at /nix/store/4cbg4rsanwlrgpgrw1926lxhy1723k70-source/lib/trivial.nix:821:11:
          820|         builtins.trace "evaluation warning: ${msg}" (
          821|           abort "NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors."
             |           ^
          822|         )

       error: evaluation aborted with the following error message: 'NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors.'

       note: trace involved the following derivations:
       derivation 'darwin-system-26.05.52d0615'
       derivation 'etc'

I believe this is actually caused by the combination of flake-utils + the way they're doing

        pkgs = nixpkgs.legacyPackages.${system};
        inherit (pkgs.lib) hasSuffix optionalAttrs;