this derivation will be built:
  /nix/store/653293sl1r5x234p9yg1m95hrj9s07ah-spec-nixfmt.drv
building '/nix/store/653293sl1r5x234p9yg1m95hrj9s07ah-spec-nixfmt.drv' on 'grpc://farm.numtide.com:50051?client-cert=/run/secrets/vars/per-machine/bld1/nix-farm-ci/crt&client-key=/run/secrets/vars/per-machine/bld1/nix-farm-ci/key&connect-timeout=22&system=aarch64-linux'
building '/nix/store/653293sl1r5x234p9yg1m95hrj9s07ah-spec-nixfmt.drv' on farm.numtide.com:50051
spec-nixfmt> elastic-arm-4136a2ea: building 653293sl1r5x234p9yg1m95hrj9s07ah-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