these 2 derivations will be built:
  /nix/store/vsia0c6hgxv7nqcwk94rgadcnlq3kdr9-closure-info.drv
  /nix/store/k1fgzpvb153nfvkq7drgnfj340gnp1dw-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
error: path '/nix/store/jymgdjwxjfqk1rzh8055wg50p9m4awxm-check-vars' is not valid
error: Cannot build '/nix/store/k1fgzpvb153nfvkq7drgnfj340gnp1dw-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/jymgdjwxjfqk1rzh8055wg50p9m4awxm-check-vars