i am trying to build rustfilt with this:

  rustfilt = pkgs.rustPlatform.buildRustPackage rec {
    pname = "rustfilt";
    version = "0.2.1";

    src = pkgs.fetchCrate {
      inherit pname version;
      sha256 = "sha256-Xo6qM2qdzkvoLkOsxksKdpi1rkpBKPGrPxz4zJ3EVyY=";
    };

    cargoHash = "";
    cargoDepsName = pname;
  };

but the problem is that the package doesn't contain a cargo lock file
so it fails in fetch-cargo-vendor-util

In reply to @crop_tech:matrix.org

i am trying to build rustfilt with this:

  rustfilt = pkgs.rustPlatform.buildRustPackage rec {
    pname = "rustfilt";
    version = "0.2.1";

    src = pkgs.fetchCrate {
      inherit pname version;
      sha256 = "sha256-Xo6qM2qdzkvoLkOsxksKdpi1rkpBKPGrPxz4zJ3EVyY=";
    };

    cargoHash = "";
    cargoDepsName = pname;
  };

but the problem is that the package doesn't contain a cargo lock file
so it fails in fetch-cargo-vendor-util

  = note:  "cc" "-m64" "/tmp/nix-shell.dAjGsj/rustcl8zW27/symbols.o" "<3 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,libcfg_if-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,liblibc-*,librustc_std_workspace_core-*,liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/nix-shell.dAjGsj/rustcl8zW27/raw-dylibs" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/home/framework-16/Documents/ALVR/target/debug/build/serde-77f00400c2754ee5/build_script_build-77f00400c2754ee5" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs" "-Wl,--push-state,--no-as-needed" "-lwayland-client" "-lxkbcommon" "-Wl,--pop-state"
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: Could not start dynamically linked executable: /nix/store/r375wnhlcgs833kc7jcdimsn4ch8niyq-rust-mixed/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld/ld.lld
          NixOS cannot run dynamically linked executables intended for generic
          linux environments out of the box. For more information, see:
          https://nix.dev/permalink/stub-ld
          clang: error: unable to execute command: No such file or directory
          clang: error: linker command failed due to signal (use -v to see invocation)
          

error: could not compile `serde` (build script) due to 1 previous error