How to statically compile a Rust binary using MUSL

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cargo new rust-static-nix
cd rust-static-nix
cargo build
# create/copy default.nix
nix-build

default.nix

let
  base-nixpkgs = import <nixpkgs> {};
  mozillaOverlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
  nixpkgs = import <nixpkgs> { overlays = [ mozillaOverlay ]; };
  rust = (nixpkgs.rustChannelOf { channel = "stable"; }).rust.override {
    targets = [ "x86_64-unknown-linux-musl" ];
  };
  rustPlatform = nixpkgs.makeRustPlatform {
    cargo = rust;
    rustc = rust;
  };
in

rustPlatform.buildRustPackage {
  name = "rust-static-nix";
  src = ./.;
  cargoSha256 = "0jacm96l1gw9nxwavqi1x4669cg6lzy9hr18zjpwlcyb3qkw9z7f";
  target = "x86_64-unknown-linux-musl";
}