this derivation will be built:
  /nix/store/kci877b85dxg5p2b0qj8bayqdj8cs92j-spec-rustfmt.drv
building '/nix/store/kci877b85dxg5p2b0qj8bayqdj8cs92j-spec-rustfmt.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=20&system=aarch64-linux'
building '/nix/store/kci877b85dxg5p2b0qj8bayqdj8cs92j-spec-rustfmt.drv' on farm.numtide.com:50051
spec-rustfmt> elastic-arm-234f8218: building kci877b85dxg5p2b0qj8bayqdj8cs92j-spec-rustfmt.drv
spec-rustfmt> error: this file contains an unclosed delimiter
spec-rustfmt>  --> /build/invalid/a.rs:1:12
spec-rustfmt>   |
spec-rustfmt> 1 | fn main(){
spec-rustfmt>   |          -^
spec-rustfmt>   |          |
spec-rustfmt>   |          unclosed delimiter
spec-rustfmt> 
spec-rustfmt> error: this file contains an unclosed delimiter
spec-rustfmt>  --> /build/invalid/a.rs:1:12
spec-rustfmt>   |
spec-rustfmt> 1 | fn main(){
spec-rustfmt>   |          -^
spec-rustfmt>   |          |
spec-rustfmt>   |          unclosed delimiter
spec-rustfmt> 

upload niks3: ok