these 3 derivations will be built:
  /nix/store/k166h1g8kdlac02xhp0s3a8sf9ldsra4-treefmt.toml.drv
  /nix/store/cd0r9mgqxr8mk4mx4bng6jlda4m5a4y9-treefmt.drv
  /nix/store/b463sr9xqbdnc0cjd104mdl9fa3zhm46-treefmt-check.drv
these 40 paths will be fetched (156.4 MiB download, 1.2 GiB unpacked):
  /nix/store/xrnlavkjfxarwxzqh7vk3yjbva16rpbc-clang-21.1.2
  /nix/store/kl4w4f8bb77faahsdv40gjmfzg2d081d-clang-21.1.2-lib
  /nix/store/n0pl3y0x06zgxq4a65bslvaqy3rn0j8f-clang-tools-21.1.2
  /nix/store/sqlnjj8c3n3si3sjnadhdbcwgrk97g2w-clang-wrapper-21.1.2
  /nix/store/rckafkh916d8hd4642n2hzywa7sf1npp-deadnix-1.3.1
  /nix/store/kcyldn3kr3isccbr3l66q0zmkgzad6d1-deno-2.6.3
  /nix/store/1nqqjacc6dnj61jlpgz5hk9zdjbfidbr-elfutils-0.194
  /nix/store/4qhdhmi7pzgad0zfd7c5lsg235mbf9hv-git-2.51.2
  /nix/store/pbpaldw534z1bwrxns5ah98adpwwk9ck-git-lfs-3.7.1
  /nix/store/54jkwsavi3fdciqfyjmbilq0jhvv4jga-gmp-with-cxx-6.3.0
  /nix/store/148w3ssbgc4wf6xcp6j0s5vy5mz41i8y-iana-etc-20250505
  /nix/store/297k82b8m9fvkw727w4xn9z4qip46cgh-jemalloc-5.3.0-unstable-2025-09-12
  /nix/store/64q3424klqaq5bq409nrmjmiyrs04k2a-json-c-0.18
  /nix/store/vg0afp6lmdrs4li4q4viry8blf5pbjrr-libyaml-0.2.5
  /nix/store/szjqgwcv0c593fvrjgdw4zszd5fx4p0m-nixfmt-1.1.0
  /nix/store/gdni20c8009xdz8gms6yn1r2hfhmk1jk-numactl-2.0.18
  /nix/store/r7cs2cad91rsrbl9a9xh4403jgq720gy-python3.13-cbor2-5.7.0
  /nix/store/2vk5kpv1zvn41nhppjnqd555lv3kd8kx-python3.13-colorama-0.4.6
  /nix/store/406b79klgsd5s9hz3qbdp9xbcbpn0in6-python3.13-flit-core-3.12.0
  /nix/store/fa7kh9s8mn4vk6xk6g3l5657zza43i30-python3.13-markdown-it-py-3.0.0
  /nix/store/mglpc180hphlv98w29ldx6fgavxwz428-python3.13-mdurl-0.1.2
  /nix/store/9c86vkfs0idys4vhp35bjvz276g0mfmc-python3.13-mypy-1.17.1
  /nix/store/41aj9k3h856ikl17hwqjd6js74panv64-python3.13-mypy-extensions-1.1.0
  /nix/store/ssjyr57prs6vykfvzs3srvcm7nvqc9mk-python3.13-pathspec-0.12.1
  /nix/store/1amh23481gd0d8604d5mlxj3fiba3sg3-python3.13-pytest-8.4.2
  /nix/store/nrqf7kmlhisk754q80bkcrgzga54bvz9-python3.13-python-dateutil-2.9.0.post0
  /nix/store/yv88fk5ya2c35gbady8ssmg3l92k4vki-python3.13-pyyaml-6.0.3
  /nix/store/7gss3axgxr5h3d4zq4ykryg2wq411qpb-python3.13-remarshal-1.2.0
  /nix/store/xnp6l19q5b8qgxfx2hlrlsmixfn59533-python3.13-rich-14.1.0
  /nix/store/5b806arkfpznywa5b5cp0h2pr31nzhfg-python3.13-rich-argparse-1.7.1
  /nix/store/fxbffn4g9z7l4livi6wm48yb162bc1ga-python3.13-ruamel-base-1.0.0
  /nix/store/prpbn02py0x7xgb4fk1xmgzghix6wnxb-python3.13-ruamel-yaml-0.18.14
  /nix/store/zs5kbqpr3dj8rb4szgrp1l3pnl03la6d-python3.13-ruamel-yaml-clib-0.2.12
  /nix/store/89kp5ww3adl1fgcm41k357ky6vnqsy92-python3.13-six-1.17.0
  /nix/store/j5bq6balpx7l4lhdj7z89z0xvb7w722k-python3.13-tomlkit-0.13.3
  /nix/store/1m2hgwaar1fmvjkr9jl992yg95h79yw7-python3.13-typing-extensions-4.15.0
  /nix/store/kzzkd7nynly3yllcf64ql7w88bx2i8dn-python3.13-u-msgpack-python-2.8.0
  /nix/store/7xva92dr1p9s81f0wsrvm3jmc5b5p4mw-ruff-0.14.9
  /nix/store/rkjabsxaza38l5msg0qcir6ypprnvbb1-treefmt-2.4.0
  /nix/store/xc4xbvx0jl2xhx1gl1x6xdmf9s9lsp8d-yamlfmt-0.20.0
building '/nix/store/k166h1g8kdlac02xhp0s3a8sf9ldsra4-treefmt.toml.drv'
treefmt.toml> 
building '/nix/store/cd0r9mgqxr8mk4mx4bng6jlda4m5a4y9-treefmt.drv'
building '/nix/store/b463sr9xqbdnc0cjd104mdl9fa3zhm46-treefmt-check.drv'
treefmt-check> treefmt v2.4.0traversed 51 files
treefmt-check> emitted 42 files for processing
treefmt-check> formatted 42 files (1 changed) in 415ms
treefmt-check>  M src/nix-eval-jobs.cc
treefmt-check> diff --git a/src/nix-eval-jobs.cc b/src/nix-eval-jobs.cc
treefmt-check> index c4c9081..7b2be0f 100644
treefmt-check> --- a/src/nix-eval-jobs.cc
treefmt-check> +++ b/src/nix-eval-jobs.cc
treefmt-check> @@ -37,8 +37,8 @@
treefmt-check>  #include <nix/util/users.hh>
treefmt-check>  #include <nix/util/util.hh>
treefmt-check>  #ifdef __linux__
treefmt-check> -#  include <sched.h>
treefmt-check> -#  include <nix/util/linux-namespaces.hh>
treefmt-check> +#include <sched.h>
treefmt-check> +#include <nix/util/linux-namespaces.hh>
treefmt-check>  #endif
treefmt-check>  #include <sys/signal.h>
treefmt-check>  #include <variant>
treefmt-check> @@ -539,8 +539,9 @@ auto main(int argc, char **argv) -> int {
treefmt-check>                  if (unshare(CLONE_NEWNS) == -1) {
treefmt-check>                      throw nix::SysError("setting up a private mount namespace");
treefmt-check>                  }
treefmt-check> -            } catch (nix::Error & e) {
treefmt-check> -                nix::warn("failed to set up a private mount namespace: %s", e.msg());
treefmt-check> +            } catch (nix::Error &e) {
treefmt-check> +                nix::warn("failed to set up a private mount namespace: %s",
treefmt-check> +                          e.msg());
treefmt-check>              }
treefmt-check>          }
treefmt-check>  #endif
error: Cannot build '/nix/store/b463sr9xqbdnc0cjd104mdl9fa3zhm46-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/rj95adgwfmmghm93g3b0yglvag2vx5w2-treefmt-check
       Last 25 log lines:
       > --- a/src/nix-eval-jobs.cc
       > +++ b/src/nix-eval-jobs.cc
       > @@ -37,8 +37,8 @@
       >  #include <nix/util/users.hh>
       >  #include <nix/util/util.hh>
       >  #ifdef __linux__
       > -#  include <sched.h>
       > -#  include <nix/util/linux-namespaces.hh>
       > +#include <sched.h>
       > +#include <nix/util/linux-namespaces.hh>
       >  #endif
       >  #include <sys/signal.h>
       >  #include <variant>
       > @@ -539,8 +539,9 @@ auto main(int argc, char **argv) -> int {
       >                  if (unshare(CLONE_NEWNS) == -1) {
       >                      throw nix::SysError("setting up a private mount namespace");
       >                  }
       > -            } catch (nix::Error & e) {
       > -                nix::warn("failed to set up a private mount namespace: %s", e.msg());
       > +            } catch (nix::Error &e) {
       > +                nix::warn("failed to set up a private mount namespace: %s",
       > +                          e.msg());
       >              }
       >          }
       >  #endif
       For full logs, run:
         nix log /nix/store/b463sr9xqbdnc0cjd104mdl9fa3zhm46-treefmt-check.drv