these 2 derivations will be built:
  /nix/store/x1d6qmh56197rrv7ikg80axpy5643zky-nix-conformance.drv
  /nix/store/xq2kqnnqn7saww0q0yqq8gsqnm71qq21-nix-conformance-reference.drv
building '/nix/store/x1d6qmh56197rrv7ikg80axpy5643zky-nix-conformance.drv'
nix-conformance> structuredAttrs is enabled
building '/nix/store/xq2kqnnqn7saww0q0yqq8gsqnm71qq21-nix-conformance-reference.drv'