these 7 derivations will be built:
  /nix/store/40z1c58ihqqxwm8gfij8ifi4vl9nhn4a-futures-sink-0.3.34.drv
  /nix/store/cldbsljw588lg1b1g7513lwap6rgfbhs-futures-task-0.3.34.drv
  /nix/store/cvgm5ic76wmm7fcq6kpkh6a1afxid0qw-futures-macro-0.3.34.drv
  /nix/store/dajpb8wm9l9981wjvwvfi0x8aw1592jv-futures-util-0.3.34.drv
  /nix/store/n3cg8iq3ivixxrgx451zhfy4fl065p89-futures-core-0.3.34.drv
  /nix/store/pxszzknrzdgzpbf681dcrldz8c75vb4x-cargo-vendor-dir.drv
  /nix/store/i0d26bpp1bldc29s43ynzak2pa8gm1gh-fast-nix-gc-0.1.0.drv