this derivation will be built:
  /nix/store/s7fmm37zjkm543cg2pd0sb7wvjjs0j27-spec-nixfmt.drv
this path will be fetched (0.4 KiB download, 0.7 KiB unpacked):
  /nix/store/f331d1g7mpdxckwswvg8qr7fxmnsv06i-writable-tmpdir-as-home-hook
building '/nix/store/s7fmm37zjkm543cg2pd0sb7wvjjs0j27-spec-nixfmt.drv' on 'ssh-ng://customer@mac02.m.ntd.one'
building '/nix/store/s7fmm37zjkm543cg2pd0sb7wvjjs0j27-spec-nixfmt.drv'
spec-nixfmt> invalid/a.nix:1:7:
spec-nixfmt>   |
spec-nixfmt> 1 | { a = ;
spec-nixfmt>   |       ^^
spec-nixfmt> unexpected ";<newline>"
spec-nixfmt> expecting expression
spec-nixfmt> 
spec-nixfmt> invalid/a.nix:1:7:
spec-nixfmt>   |
spec-nixfmt> 1 | { a = ;
spec-nixfmt>   |       ^^
spec-nixfmt> unexpected ";<newline>"
spec-nixfmt> expecting expression
spec-nixfmt> 

upload niks3: ok