these 3 derivations will be built:
  /nix/store/428xa9fw9927s71nvm378i17cg9qk7xx-treefmt.toml.drv
  /nix/store/0gj5n527hgv5506ks4k9fv552s47fpcc-treefmt.drv
  /nix/store/g42fn1mdrvdgg0mqfvjj5n79545y52vk-treefmt-check.drv
this path will be fetched (6.0 MiB download, 18.4 MiB unpacked):
  /nix/store/zfrqd9ahnccql0zgzgc5swwi4zmm14zl-rustfmt-1.99.0
building '/nix/store/428xa9fw9927s71nvm378i17cg9qk7xx-treefmt.toml.drv'
treefmt.toml> structuredAttrs is enabled
building '/nix/store/0gj5n527hgv5506ks4k9fv552s47fpcc-treefmt.drv'
treefmt> structuredAttrs is enabled
building '/nix/store/g42fn1mdrvdgg0mqfvjj5n79545y52vk-treefmt-check.drv'
treefmt-check> treefmt v2.6.0traversed 19 files
treefmt-check> emitted 8 files for processing
treefmt-check> formatted 8 files (0 changed) in 48ms