)]}'
{
  "commit": "bdaf7267800751d2480b0680d84e510e43f9ca5f",
  "tree": "9c7e277f66c0d0da8f1f31eea4eb060a99ca0a69",
  "parents": [
    "bd75cfcf5c906fb6b88515c993edcd34bfadeecb"
  ],
  "author": {
    "name": "twerth CA",
    "email": "twerth@google.com",
    "time": "Wed Aug 26 23:56:45 2026 -0700"
  },
  "committer": {
    "name": "Copybara-Service",
    "email": "copybara-worker@google.com",
    "time": "Wed Aug 26 23:58:09 2026 -0700"
  },
  "message": "Omit redundant \u0027Error in fail:\u0027 prefix from Starlark fail() error messages.\n\nCalling `fail()` in Starlark previously formatted the final error line with `Error in fail: \u003cmessage\u003e` because `fail` is a builtin function and stack trace formatting prepended `Error in \u003cbuiltin\u003e: `. Because `fail()` is the standard mechanism in Starlark for rules, macros, and extensions to raise user-facing errors (such as invalid attribute values or unsupported targets), this prefix was redundant and made user errors look like internal failures within the `fail` function itself.\n\nFormat leaf `fail()` errors using the standard `Error: ` prefix, while preserving `Error in \u003cbuiltin\u003e: ` for other builtin functions (such as `getattr()`, `struct()`, or `dict()`).\n\nFor example, when a rule implementation calls `fail(\"unsupported platform: %s\" % ctx.attr.platform)`:\n\nBefore:\n```\nTraceback (most recent call last):\n\tFile \"/workspace/pkg/rules.bzl\", line 5, column 9, in _impl\n\t\tfail(\"unsupported platform: %s\" % ctx.attr.platform)\nError in fail: unsupported platform: foo\n```\n\nAfter:\n```\nTraceback (most recent call last):\n\tFile \"/workspace/pkg/rules.bzl\", line 5, column 9, in _impl\n\t\tfail(\"unsupported platform: %s\" % ctx.attr.platform)\nError: unsupported platform: foo\n```\n\nRELNOTES: Starlark `fail()` calls now format error messages with `Error: ` instead of `Error in fail: `.\nResolves https://github.com/bazelbuild/bazel/issues/21523.\nPiperOrigin-RevId: 971759352\nChange-Id: Idda5352f05c8d7c297261ca65e4d2906369513a8\n",
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