these 2 derivations will be built:
  /nix/store/1mv27df5fpsbpajlwv6p4h4lf3j1rk5p-closure-info.drv
  /nix/store/6s9knikvci616xzrbvgqd2f16wcj1qd7-check-vars.drv
error: path '/nix/store/m5mw34kyciz5lj0adlk9ps9f3a4x1ny8-check-vars' is not valid
error: Cannot build '/nix/store/6s9knikvci616xzrbvgqd2f16wcj1qd7-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/m5mw34kyciz5lj0adlk9ps9f3a4x1ny8-check-vars