this derivation will be built:
  /nix/store/mrgaqanwg5h1cfsa2cp1ifylrfzh716f-bcachefs-module-7.0.14-15-pve.drv
building '/nix/store/mrgaqanwg5h1cfsa2cp1ifylrfzh716f-bcachefs-module-7.0.14-15-pve.drv'...
error: Cannot build '/nix/store/mrgaqanwg5h1cfsa2cp1ifylrfzh716f-bcachefs-module-7.0.14-15-pve.drv'.
       Reason: builder failed with exit code 2.
       Output paths:
         /nix/store/vhan55m524xjh5arpn44a51r9nagyrqg-bcachefs-module-7.0.14-15-pve
       Last 25 log lines:
       >    |
       > 25 |     pub fn to_compile_error(&self) -> TokenStream {
       >    |     ---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       >    |     |
       >    |     help: consider restricting its visibility: `pub(crate)`
       >
       > error[E0463]: can't find crate for `core`
       >   |
       >   = note: the `target` target may not be installed
       >   = help: consider downloading the target with `rustup target add target`
       >   = help: consider building the standard library from source with `cargo build -Zbuild-std`
       >
       > error: aborting due to 1 previous error
       >
       > For more information about this error, try `rustc --explain E0463`.
       > make[5]: *** [src/fs/bcachefs/Makefile:440: src/fs/bcachefs/bitflags.o] Error 1
       > warning: 8 warnings emitted
       >
       > make[4]: *** [/build/bcachefs-dkms-src/kdir/headers/linux-headers-7.0.14-15-pve/scripts/Makefile.build:548: src/fs/bcachefs] Error 2
       > make[3]: *** [/build/bcachefs-dkms-src/kdir/headers/linux-headers-7.0.14-15-pve/Makefile:2134: .] Error 2
       > make[2]: *** [/build/bcachefs-dkms-src/kdir/headers/linux-headers-7.0.14-15-pve/Makefile:248: __sub-make] Error 2
       > make[2]: Leaving directory '/build/bcachefs-dkms-src'
       > make[1]: *** [Makefile:248: __sub-make] Error 2
       > make[1]: Leaving directory '/build/bcachefs-dkms-src/kdir/headers/linux-headers-7.0.14-15-pve'
       > make: *** [Makefile:18: default] Error 2
       For full logs, run:
         nix log /nix/store/mrgaqanwg5h1cfsa2cp1ifylrfzh716f-bcachefs-module-7.0.14-15-pve.drv