these 4 derivations will be built:
  /nix/store/zy2q11c32cvbbjdynbngy49vpp354h86-clan-cli-source.drv
  /nix/store/5z43jcm203zh06g8z4590aplb1shl1n4-clan-cli.drv
  /nix/store/y4pgk6ckh0f42f3jnaj39zkq1zmhq47j-closure-info.drv
  /nix/store/d76cyi9x6gry04lwd4sfrgsg8y13sxnb-check-vars.drv
error: path '/nix/store/20ylg57did7n2yx3501v4gm89nlvmvw0-check-vars' is not valid
error: Cannot build '/nix/store/d76cyi9x6gry04lwd4sfrgsg8y13sxnb-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/20ylg57did7n2yx3501v4gm89nlvmvw0-check-vars