)]}'
{
  "commit": "660070f8469cd8a80536408db98e56facbd91580",
  "tree": "453207ce6634cbf6034414d675df6996b794b121",
  "parents": [
    "d89dac5cfc572fe83a24e255f1dda922aadfc7c2"
  ],
  "author": {
    "name": "Alexandre Rostovtsev",
    "email": "arostovtsev@google.com",
    "time": "Wed Sep 16 07:05:50 2026 -0400"
  },
  "committer": {
    "name": "GitHub",
    "email": "noreply@github.com",
    "time": "Wed Sep 16 11:05:50 2026 +0000"
  },
  "message": "Add cast and isinstance keywords (#1505)\n\nFinishing support for the type syntax proposed in\nhttps://github.com/bazelbuild/starlark/pull/362\n\nAfter some reflection, I think we should always parse cast/isinstance as\nkeywords (requiring 2 arguments, one of which is a value expression and\nthe other a type expression) since permitting pre-type Starlark syntax\nis likely to only lead to confusion, and would be quite difficult to get\nright.\n\nNote that this is an **incompatible change**: forms like `cast(x, y, z)`\nor `cast \u003d foo` will now be a parse error. However, in practice, I\nobserve no occurrences of `cast` or `isinstance` used as identifiers in\nany Starlark code in Google\u0027s monorepo, so I believe that it\u0027s rather\nunlikely to break anyone.\n\nStore the parsed cast/isinstance exprs as `CallExpr`-s (to avoid\ndiverging their formatting/walking/etc. support from call expressions)\nwith an enum field to mark that they are of a special kind.\n\n## Buildtools PR checklist\n\n- [X] The code in this PR is covered by unit/integration tests.\n- [X] I have tested these changes and provide testing instructions\nbelow.\n- [ ] I have either responded to, or resolved all Gemini comments on the\nPR.\n- [X] I have read Google Eng Practices on [Small\nChanges](https://google.github.io/eng-practices/review/developer/small-cls.html),\nthis PR either follows these guidelines or the description provides\nreasoning for why they can not be followed.",
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