01_wait_forever error: unused import: `raspberrypi::*` with Rust 1.82.0

[ChocolateLoverRaj]

Rust versions tested:

cargo 1.84.0-nightly (8c30ce536 2024-10-15)
cargo 1.82.0 (8f40fc59f 2024-08-21)

I get the error with both of the versions.

Output:

make qemu

Compiling kernel ELF - rpi3
   Compiling mingo v0.1.0 (/home/rajas/Documents/rust-raspberrypi-OS-tutorials/01_wait_forever)
error: unused import: `raspberrypi::*`
  --> src/bsp.rs:11:9
   |
11 | pub use raspberrypi::*;
   |         ^^^^^^^^^^^^^^
   |
   = note: `-D unused-imports` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(unused_imports)]`

error: could not compile `mingo` (bin "kernel") due to 1 previous error
make: *** [Makefile:123: target/aarch64-unknown-none-softfloat/release/kernel] Error 101

make qemu runs successfully If I comment out the unused line:

// #[cfg(any(feature = "bsp_rpi3", feature = "bsp_rpi4"))]
// pub use raspberrypi::*;

OS: NixOS
Flake I'm using for devShell:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    rust-overlay.url = "github:oxalica/rust-overlay";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        overlays = [ (import rust-overlay) ];
        pkgs = import nixpkgs {
          inherit system overlays;
        };
      in
      {
        devShells.default = with pkgs; mkShell {
          buildInputs = [
            (rust-bin.selectLatestNightlyWith (toolchain: toolchain.default.override {
              extensions = [ "rust-src" "llvm-tools-preview" ];
              targets = [ "aarch64-unknown-none-softfloat" ];
            }))
            cargo-bootimage
            qemu
            gnumake
            cargo-binutils
            rustfilt
          ];
        };
      }
    );
}