these 3 derivations will be built:
  /nix/store/qkq0l0a2ppilxrd543gaig1ikymlnj58-clan-cli.drv
  /nix/store/xm9yv90m5rzq67cv4lgmdv2kzlbqbaw3-closure-info.drv
  /nix/store/asjvdll619v8m57q57lxhgbxp24z0491-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/q9b04krfx4yvjj62w14v8j3yilslkidb-check-vars' is not valid
error: Cannot build '/nix/store/asjvdll619v8m57q57lxhgbxp24z0491-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/q9b04krfx4yvjj62w14v8j3yilslkidb-check-vars