these 2 derivations will be built:
  /nix/store/ayqw9nq68q03dkxpclf9fq4ydhj4h3xh-closure-info.drv
  /nix/store/29ch6dflhglkfqwjm1qfgd9bx239b8i2-check-vars.drv
error: path '/nix/store/mam7y2fzz95fw8556az9izjimwmf8rf2-check-vars' is not valid
error: Cannot build '/nix/store/29ch6dflhglkfqwjm1qfgd9bx239b8i2-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/mam7y2fzz95fw8556az9izjimwmf8rf2-check-vars