this derivation will be built:
  /nix/store/lwn2dswzl6pqfx8chvx0l3m5gmq4sza4-inputDerivation-effect-docs-pages.drv
building '/nix/store/lwn2dswzl6pqfx8chvx0l3m5gmq4sza4-inputDerivation-effect-docs-pages.drv'...