these 4 derivations will be built:
  /nix/store/7v7l2kps65ib8d1nmp9rppy5c566gibr-vendor-cargo-deps.drv
  /nix/store/dgmvxq6n0gbr5m7i9miqin0hnc3nyvs3-source.drv
  /nix/store/d06530ahk3c1mb0krwsiny22jnd78k08-herdr-eternal-deps-0.1.0.drv
  /nix/store/bln978dsi4hws0d02jmn4j2pqgym46py-herdr-eternal-test-0.1.0.drv
error: Cannot build '/nix/store/bln978dsi4hws0d02jmn4j2pqgym46py-herdr-eternal-test-0.1.0.drv'.
       Reason: builder failed with exit code 101.
       Output paths:
         /nix/store/1d511ca22hi48llj0859alsvi1pn0s5f-herdr-eternal-test-0.1.0
       Last 25 log lines:
       >             and 54 others
       > note: required by a bound in `nix::unistd::dup2`
       >    --> /nix/store/hzrka0db1qnymsdkf8snxbs0y733wzg7-vendor-cargo-deps/c19b7c6f923b580ac259164a89f2577984ad5ab09ee9d583b888f934adbbe8d0/nix-0.31.3/src/unistd.rs:543:17
       >     |
       > 543 | pub fn dup2<Fd: std::os::fd::AsFd>(oldfd: Fd, newfd: &mut std::os::fd::OwnedFd) -> Result<()> {
       >     |                 ^^^^^^^^^^^^^^^^^ required by this bound in `dup2`
       >
       > error[E0308]: mismatched types
       >    --> server/src/lib.rs:742:40
       >     |
       > 742 |             nix::unistd::dup2(exit_fd, 3)
       >     |             -----------------          ^ expected `&mut OwnedFd`, found integer
       >     |             |
       >     |             arguments to this function are incorrect
       >     |
       > note: function defined here
       >    --> /nix/store/hzrka0db1qnymsdkf8snxbs0y733wzg7-vendor-cargo-deps/c19b7c6f923b580ac259164a89f2577984ad5ab09ee9d583b888f934adbbe8d0/nix-0.31.3/src/unistd.rs:543:8
       >     |
       > 543 | pub fn dup2<Fd: std::os::fd::AsFd>(oldfd: Fd, newfd: &mut std::os::fd::OwnedFd) -> Result<()> {
       >     |        ^^^^
       >
       > Some errors have detailed explanations: E0277, E0308.
       > For more information about an error, try `rustc --explain E0277`.
       > error: could not compile `herdr-eternal-server` (lib) due to 2 previous errors
       > warning: build failed, waiting for other jobs to finish...
       For full logs, run:
         nix log /nix/store/bln978dsi4hws0d02jmn4j2pqgym46py-herdr-eternal-test-0.1.0.drv