It’s possible to write arbitrary text after specifying the @MainActor for a closure.

[omochi]

Description

The following strange code compiles incorrectly:

Reproduction

Task { @MainActor(今日は日差しが強い) in
}

Expected behavior

It should result in some kind of error.

Environment

$ swift --version
swift-driver version: 1.115 Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
Target: arm64-apple-macosx15.0

Additional information

No response

[AnthonyLatsis]

A different test case:

let _: @MainActor(abcdef) () -> Void = {}