swift

9c76a294 - [AutoDiff] Add `@differentiable` attribute SILGen assertion. (#27650)

[AutoDiff] Add `@differentiable` attribute SILGen assertion. (#27650) Previously, `@differentiable` attribute SILGen lowering was skipped if the attribute did not have resolved parameter indices. This led to unexpected and difficult-to-debug bugs like TF-888. Re-add the assertion for robustness. This is possible after https://github.com/apple/swift/pull/27613, which fixed the underlying issue with parameter indices resolution.