March 2026 monthly summary for the dart-lang/sdk repository, focusing on correctness and stability of FFI-related analyzer behavior and alignment with the CFE. The work centers on validating @Native annotations for extension members and improving diagnostics consistency across the toolchain.

February 2026: Focused on strengthening test clarity and maintainability in the dart-lang/sdk repo. Migrated 9 static-check tests from the old multitest format to a new explicit error-expectations format, improving diagnostic precision for analyzer and CFE failures and easing ongoing maintenance. This work, implemented under the [vm/ffi] area, updates tests such as regress_44986_test.dart, regress_46085_test.dart, regress_47673_2_test.dart, regress_51041_test.dart, vmspecific_function_callbacks_negative_test.dart, vmspecific_regress_38993_test.dart, vmspecific_static_checks_ffinative_test.dart, vmspecific_static_checks_varargs_test.dart, and vmspecific_variance_function_checks_test.dart, and aligns with the project’s testing conventions (TEST, R, Change-Id). There were no separate bug fixes recorded for February 2026; the primary business value comes from improved test reliability, faster feedback, and reduced maintenance burden through clearer error expectations and better integration with analyzer/CFE.