elastic-arm-234f8218: building jzhy64ksc87fvpq7kzhl6s2jwln4xkm3-spec-nbstripout.drv
/nix/store/mkbzf98d1n5lxa1jsxfp2jmbfhy5gv7l-python3.14-nbformat-5.10.4/lib/python3.14/site-packages/nbformat/__init__.py:96: MissingIDFieldWarning: Cell is missing an id field, this will become a hard error in future nbformat versions. You may want to use `normalize()` on your notebooks before validations (available since nbformat 5.1.4). Previous versions of nbformat are fixing this issue transparently, and will stop doing so in the future.
  validate(nb)
/nix/store/mkbzf98d1n5lxa1jsxfp2jmbfhy5gv7l-python3.14-nbformat-5.10.4/lib/python3.14/site-packages/nbformat/__init__.py:96: MissingIDFieldWarning: Cell is missing an id field, this will become a hard error in future nbformat versions. You may want to use `normalize()` on your notebooks before validations (available since nbformat 5.1.4). Previous versions of nbformat are fixing this issue transparently, and will stop doing so in the future.
  validate(nb)
No valid notebook detected in 'invalid/a.ipynb'
No valid notebook detected in 'invalid/a.ipynb'