these 2 derivations will be built:
  /nix/store/a50zv607a726znmw2p0yn30nqjxqv1y6-closure-info.drv
  /nix/store/gp4clz4d1xqyafl7wd3xdkc18ahld8vy-check-vars.drv
error: path '/nix/store/s4ai2pyq6v18s0fjzk018wzm6ybp03qi-check-vars' is not valid
error: Cannot build '/nix/store/gp4clz4d1xqyafl7wd3xdkc18ahld8vy-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/s4ai2pyq6v18s0fjzk018wzm6ybp03qi-check-vars