these 2 derivations will be built:
  /nix/store/jas81pxvx8hf3w95704ny85gc56l0qyr-nix-conformance.drv
  /nix/store/8zaihk2j6p4wkian9jn7xhn024w1cn4w-nix-conformance-reference.drv
building '/nix/store/jas81pxvx8hf3w95704ny85gc56l0qyr-nix-conformance.drv'
nix-conformance> structuredAttrs is enabled
building '/nix/store/8zaihk2j6p4wkian9jn7xhn024w1cn4w-nix-conformance-reference.drv'