these 2 derivations will be built:
  /nix/store/hyl4rd19xr1l5sy8q7cxbfn2dkx4216i-mcptoon-0.8.15.drv
  /nix/store/ii7f43fmr8q9390625zbfm9kqrj2jc7s-check-mcptoon.drv
error: Cannot build '/nix/store/hyl4rd19xr1l5sy8q7cxbfn2dkx4216i-mcptoon-0.8.15.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/11cznq9kaysqbs2qgwrifbh8cwh793ri-mcptoon-0.8.15
         /nix/store/rzj55ymiskc1sqnri5b8pbnjnsc0lmad-mcptoon-0.8.15-dist
       Last 25 log lines:
       > tests/test_v07_spec2026.py .....................                         [ 98%]
       > tests/test_v081_env_headers.py .............                             [ 99%]
       > tests/test_watch.py ..................                                   [100%]
       >
       > =================================== FAILURES ===================================
       > ____ TestPreferInstalledRunners.test_a_module_without_main_is_not_runnable _____
       >
       > self = <tests.test_discover.TestPreferInstalledRunners object at 0x7ffff509bbb0>
       >
       >     def test_a_module_without_main_is_not_runnable(self):
       >         """`json` resolves but has no `__main__`, so `python -m json` would die.
       >     
       >         Pin the real function (not a mock) against a stdlib module that is
       >         importable everywhere — this is the check that keeps a bare
       >         `find_spec(module)` from writing a dead server entry.
       >         """
       > >       assert discover_mod._resolve_local_module("json") is None
       > E       AssertionError: assert ['/nix/store/d64q19q1xjdwfhqx6czvrjgrhq0n3lcc-python3-3.14.7/bin/python3.14', '-m', 'json'] is None
       > E        +  where ['/nix/store/d64q19q1xjdwfhqx6czvrjgrhq0n3lcc-python3-3.14.7/bin/python3.14', '-m', 'json'] = <function _resolve_local_module at 0x7ffff51ee980>('json')
       > E        +    where <function _resolve_local_module at 0x7ffff51ee980> = discover_mod._resolve_local_module
       >
       > tests/test_discover.py:472: AssertionError
       > =========================== short test summary info ============================
       > FAILED tests/test_discover.py::TestPreferInstalledRunners::test_a_module_without_main_is_not_runnable - AssertionError: assert ['/nix/store/d64q19q1xjdwfhqx6czvrjgrhq0n3lcc-python...
       > ===== 1 failed, 1932 passed, 11 skipped, 4 deselected in 78.92s (0:01:18) ======
       For full logs, run:
         nix log /nix/store/hyl4rd19xr1l5sy8q7cxbfn2dkx4216i-mcptoon-0.8.15.drv
error: Cannot build '/nix/store/ii7f43fmr8q9390625zbfm9kqrj2jc7s-check-mcptoon.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/mqrjvgg5w32b8vlq9gkbxc053r1481sq-check-mcptoon