bazel syntax: assert validity of results from Java calls

Other than legal Starlark values, the implicit conversion to Starlark
now accepts only null, List, and Map.

- make Attribute.{Computed,LateBound}Default implement StarlarkValue
- move SkylarkType.convertToSkylark to Starlark.fromJava.
- move SkylarkType.isSkylarkAcceptable to Starlark.valid.
- move support for legacy implicit NestedSet conversion to MethodDescriptor.
  I was hoping to delete this but there are still a dozen or so clients to fix.

PiperOrigin-RevId: 281382879
18 files changed
tree: c53980f637d1bda50a8510ab7bc0c9971bc6a39c
  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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