Change:
<del> { lib , callPackage , extraPackages ? (ps: [ ]) , runCommand </del> <ins> { lib, callPackage, coreutils, fetchFromGitHub, git, gitUpdater, glibcLocales, python3Packages, </ins> }: let <del> xonsh-unwrapped = callPackage ./unwrapped.nix { }; inherit (xonsh-unwrapped.passthru) python; pythonEnv = python.withPackages (ps: [ (ps.toPythonModule xonsh-unwrapped) ] ++ extraPackages ps); </del> <ins> argset = { pname = "xonsh"; version = "0.17.0"; pyproject = true; # PyPI package ships incomplete tests src = fetchFromGitHub { owner = "xonsh"; repo = "xonsh"; rev = "refs/tags/${argset.version}"; hash = "sha256-9sRY9aetWWXzCFfgdHCBCia48THIJcMxsYMnFR6Xa8A="; }; nativeBuildInputs = with python3Packages; [ setuptools wheel ]; propagatedBuildInputs = (with python3Packages; [ ply prompt-toolkit pygments ]); nativeCheckInputs = [ git glibcLocales ] ++ (with python3Packages; [ pip pyte pytest-mock pytest-subprocess pytestCheckHook requests ]); disabledTests = [ # fails on sandbox "test_colorize_file" "test_loading_correctly" "test_no_command_path_completion" "test_bsd_man_page_completions" "test_xonsh_activator" # fails on non-interactive shells "test_capture_always" "test_casting" "test_command_pipeline_capture" "test_dirty_working_directory" "test_man_completion" "test_vc_get_branch" "test_bash_and_is_alias_is_only_functional_alias" "test_spec_modifier_alias_output_format" # flaky tests "test_script" "test_alias_stability" "test_alias_stability_exception" "test_complete_import" "test_subproc_output_format" ]; disabledTestPaths = [ # fails on sandbox "tests/completers/test_command_completers.py" "tests/test_ptk_highlight.py" "tests/test_ptk_shell.py" # fails on non-interactive shells "tests/prompt/test_gitstatus.py" "tests/completers/test_bash_completer.py" ]; env.LC_ALL = "en_US.UTF-8"; postPatch = '' sed -ie 's|/bin/ls|${lib.getExe' coreutils "ls"}|' tests/test_execer.py sed -ie 's|SHELL=xonsh|SHELL=$out/bin/xonsh|' tests/test_integrations.py for script in tests/test_integrations.py scripts/xon.sh $(find -name "*.xsh"); do sed -ie 's|/usr/bin/env|${lib.getExe' coreutils "env"}|' $script done patchShebangs . ''; preCheck = '' export HOME=$TMPDIR export PATH=$out/bin:$PATH ''; passthru = { shellPath = "/bin/xonsh"; python = python3Packages.python; # To the wrapper wrapper = callPackage ./wrapper.nix { }; updateScript = gitUpdater { }; }; meta = { homepage = "https://xon.sh/"; description = "A Python-ish, BASHwards-compatible shell"; changelog = "https://github.com/xonsh/xonsh/raw/main/CHANGELOG.rst"; license = with lib.licenses; [ bsd3 ]; mainProgram = "xonsh"; maintainers = with lib.maintainers; [ AndersonTorres samlukeyes123 ]; }; }; </ins> in <del> runCommand "xonsh-${xonsh-unwrapped.version}" { inherit (xonsh-unwrapped) pname version meta; passthru = xonsh-unwrapped.passthru // { unwrapped = xonsh-unwrapped; }; } '' mkdir -p $out/bin for bin in ${lib.getBin xonsh-unwrapped}/bin/*; do ln -s ${pythonEnv}/bin/$(basename "$bin") $out/bin/ done '' </del> <ins> python3Packages.buildPythonApplication argset </ins>

Discussion:
Xonsh because of However, in unstable the is using
cc as maintainer
I am waiting for someone hit the button here: P.S.: I am not waiting anymore.
Upstream has unpinned prompt-toolkit after

Upstream issue: Since the issue seems to be specific to NixOS, let's track it here. The two commands above should only print "True". If applicable, add screenshots to help explain your problem. Tested on xonsh 0.13.3 and 0.13.4 system: host os: multi-user?: sandbox: version: nixpkgs:
Upstream fix: