Description

While creating a new project with TCA using Xcode 26 beta 7, Swift 6 mode, and SWIFT_DEFAULT_ACTOR_ISOLATION=MainActor.
I encounter a compiler error when applying the @Reducer macro to an enum.

I’m not sure whether this is a TCA issue or a compiler/Xcode, but the macro appears to fail in this configuration.

Checklist

• I have determined whether this bug is also reproducible in a vanilla SwiftUI project.
• If possible, I've reproduced the issue using the main branch of this package.
• This issue hasn't been addressed in an existing GitHub issue or discussion.

Expected behavior

No response

Actual behavior

No response

Reproducing project

@Reducer struct Feature { @ObservableState struct State: Equatable { } } @Reducer enum Path { case child(Feature) } extension Path.State: Equatable { }

The Composable Architecture version information

1.22.2

Destination operating system

iOS 26

Xcode version information

Xcode 26 beta 7

Swift Compiler version information

swift-driver version: 1.127.14.1 Apple Swift version 6.2 (swiftlang-6.2.0.19.9 clang-1700.3.19.1) Target: arm64-apple-macosx26.0