bazel syntax: move depset function out of core Starlark

(Second attempt at commit 81cd5ac6ec877f0c243bc6f6aa1ccf2e2440d9ea, rolled back in commit c555a8176b9e7a44179425ed569829047f6a5f0d)

...and into the Bazel build language's common library, alongside select.

Also, relax the assertion that corresponding depsets have equal
elements, used by serialization tests. It doesn't belong in this
package and can't be expressed without an upward dependency.

Obligatory fakes hacked in to Skydoc, this time slightly more
realistically simulating the depset function, by returning
an actual Depset, albeit empty.

Follow-up changes will move Depset and the serialization assertion.

See also: CL 308813500 (removes depset special case in Starlark.type)

PiperOrigin-RevId: 309229276
11 files changed
tree: 8731ce81f52257495baa67b23e4c2d61c5977f95
  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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