these 2 derivations will be built:
  /nix/store/x5m2pmjgqnm9r9cspbllvvd0c1vb8d4a-closure-info.drv
  /nix/store/ysfvwwcd88i9nmky069wiq9kng07brqn-check-vars.drv
error: path '/nix/store/ylshmqh47g6sldmwivxd8an8ma0dcwm1-check-vars' is not valid
error: Cannot build '/nix/store/ysfvwwcd88i9nmky069wiq9kng07brqn-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/ylshmqh47g6sldmwivxd8an8ma0dcwm1-check-vars