bazel syntax: disallow PathFragment as a Starlark value

All native functions that return a PathFragment have been updated (I think).

Also, delete SkylarkPrintable, which was implemented by Path and PathFragment,
which meant they could be used in the Skylark formatting mechanism even though
they were not true Skylark values. Now, we fail an assertion if they are used.
Deleting this interface breaks the vfs -> skylarkinterface dependency.

SkylarkPrinter can now be merged with BasePrinter.
This would leave the skylarkinterface package with one concern only: annotations.

Also, hide Appendable and Formattable from the public API.

PiperOrigin-RevId: 277970755
8 files changed
tree: 4420ee32e7fd7fbdb27a83467d3e1ac9baa99bff
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

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