these 3 derivations will be built:
  /nix/store/b01n21p1996v9lzvnnjppp8rgr7qd93s-treefmt.toml.drv
  /nix/store/v6vfv1igc3a2qj8kbngy7rgfgwkhbrj6-treefmt.drv
  /nix/store/f77jnkldiim4ys7dpqkp4yd5ck7fv4yf-treefmt-check.drv
these 2 paths will be fetched (7.1 MiB download, 23.6 MiB unpacked):
  /nix/store/6xhcjd8mz7s2sfnlkabrx1pnz6fmjygh-nixfmt-1.4.0
  /nix/store/ywjbx0pbnabhbscywxkmyrmwp0m2086q-rustfmt-1.95.0
building '/nix/store/b01n21p1996v9lzvnnjppp8rgr7qd93s-treefmt.toml.drv'
treefmt.toml> structuredAttrs is enabled
treefmt.toml> 
building '/nix/store/v6vfv1igc3a2qj8kbngy7rgfgwkhbrj6-treefmt.drv'
building '/nix/store/f77jnkldiim4ys7dpqkp4yd5ck7fv4yf-treefmt-check.drv'
treefmt-check> treefmt v2.5.0traversed 21 files
treefmt-check> emitted 10 files for processing
treefmt-check> formatted 10 files (0 changed) in 87ms