this derivation will be built:
  /nix/store/34x2krrx77p0b1cj9h6cmps1p77y3bxr-inputDerivation-effect-docs-pages.drv
building '/nix/store/34x2krrx77p0b1cj9h6cmps1p77y3bxr-inputDerivation-effect-docs-pages.drv'...