### Problem/Motivation Remove the deprecated $module_handler and $controller_resolver arguments from RouteBuilder::__construct(), rewriting the 6-argument form to the new 4-argument form introduced in drupal:11.4.0 (removed in drupal:12.0.0). The rule only rewrites calls with exactly 6 positional arguments. ### Proposed resolution Handled automatically by drupal-rector via the `RemoveRouteBuilderDeprecatedArgsRector` rule. ### How this rule was built This rule was produced with an AI-assisted workflow in which every step was verified manually by @bbrala. Its logic started from the matching drupal-digests entry, which was adapted to drupal-rector's conventions — a dedicated rule or an existing upstream rule configured into the Drupal 12 set — and covered with before/after test fixtures. Backward-compatibility was assessed and version-gated: safe rewrites are applied directly, while unsafe ones are wrapped via `DeprecationHelper` or moved to an opt-in breaking set. The rule was then live-tested against a set of contributed modules; where no contrib call site could be found, a static code sample was written in a test module to exercise it. A final automated QA pass covered type-guard, fixture coverage, BC-decision, registration and idempotency checks. ### References - Change record(s): [CR-3324751](https://www.drupal.org/node/3324751) - Related issue(s): [#3311365](https://www.drupal.org/i/3311365), [#3159210](https://www.drupal.org/i/3159210), [#3401172](https://www.drupal.org/i/3401172), [#3490069](https://www.drupal.org/i/3490069) ### Work items - Commit(s): [818d6dd54c](https://github.com/palantirnet/drupal-rector/commit/818d6dd54c61) - Pull request(s): [PR #355](https://github.com/palantirnet/drupal-rector/pull/355) ### Credit - Implemented by: @bbrala - Reviewed / helped by: @mglaman --- *Filed retroactively as part of the Drupal 12 rector coverage effort. Closed as fixed; credit to be applied to the contributors listed above.* *AI was used extensively to build this rule and to file this issue. See [Dries Buytaert: AI-generated Rector rules for Drupal](https://dri.es/ai-generated-rector-rules-for-drupal) and [Björn Brala: Drupal Rector rules are config, not code. Mostly.](https://www.linkedin.com/pulse/drupal-rector-rules-config-code-mostly-bj%C3%B6rn-brala-vfpwe/).*