bazel syntax: enforce that ClassObject.getValue returns legal Starlark values

EvalUtils.getAttr now enforces that the value returned by
ClassObject.getValue is a legal value.
Previously, only the ternary SkylarkClassObject.getValue method
offered this postcondition, and it wasn't enforced.

This turned up BuildConfiguration.Fragment,
which was used as a value (e.g. in ctx.fragments.android)
but had forgotten to declare its relationship to StarlarkValue.

Also:
- remove obsolete 'instanceof Class' check.
- remove try/catch of IllegalArgumentException.
  Instead do this check with narrower scope in the fragment code.
  We will fix other cases as they appear.
PiperOrigin-RevId: 284644428
6 files changed
tree: 3d946184d7dd9a422aa996a67b542c776afb4f02
  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

Bazel

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