diff --git a/stdlib/private/StdlibUnittest/StdlibUnittest.swift b/stdlib/private/StdlibUnittest/StdlibUnittest.swift index 57d19a7cfee62..d06263c3f2044 100644 --- a/stdlib/private/StdlibUnittest/StdlibUnittest.swift +++ b/stdlib/private/StdlibUnittest/StdlibUnittest.swift @@ -31,6 +31,10 @@ import WinSDK import ObjectiveC #endif +#if SWIFT_ENABLE_EXPERIMENTAL_CONCURRENCY +import _Concurrency +#endif + extension String { /// Returns the lines in `self`. public var _lines : [String] {