these 2 derivations will be built:
  /nix/store/ny5rx0riagsvj2fmz959x7bi2s29xf3h-closure-info.drv
  /nix/store/y1pizsg958wgfr65922nxh27lq9ynw35-check-vars.drv
error: path '/nix/store/blkd948dxspl0vi9a5lgm1gr57135bs6-check-vars' is not valid
error: Cannot build '/nix/store/y1pizsg958wgfr65922nxh27lq9ynw35-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/blkd948dxspl0vi9a5lgm1gr57135bs6-check-vars