Sendable autoconformance

Author: KyNorthstar

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:6.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

Sources/Either/Either.swift

@@ -14,3 +14,10 @@ public enum Either<Left, Right> {
     case left(Left)
     case right(Right)
 }
+
+
+
+// MARK: - Sendable
+// (this would be in `Either + autoconformance.swift`, but the compiler prefers it in the same file as the original declaration
+
+extension Either: Sendable where Left: Sendable, Right: Sendable {}

Tests/EitherTests/Either + autoconformance Tests.swift

@@ -371,3 +371,14 @@ final class Either___autoconformance_Tests: XCTestCase {
         }
     }
 }
+
+
+
+// MARK: - Either + Sendable
+
+// Just test whether it compiles
+
+private struct SendableConformanceTestContainer: Sendable {
+    var eitherA: Either<Int, String> = .left(7)
+    var eitherB: Either<Int, String> = .right("seven")
+}