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Avoid ObjC runtime warnings about duplicate class definitions for Serializer type #1444

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Merged
stmontgomery merged 1 commit into from
Dec 10, 2025
Merged

Avoid ObjC runtime warnings about duplicate class definitions for Serializer type #1444

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2 changes: 1 addition & 1 deletion Sources/Testing/Running/Runner.swift
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Expand Up @@ -77,7 +77,7 @@ extension Runner {
/// type at runtime, it may be better-suited for ``Configuration`` instead.
private struct _Context: Sendable {
/// A serializer used to reduce parallelism among test cases.
var testCaseSerializer: Serializer?
var testCaseSerializer: Serializer<Void>?
}

/// Apply the custom scope for any test scope providers of the traits
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7 changes: 6 additions & 1 deletion Sources/Testing/Support/Serializer.swift
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Expand Up @@ -42,8 +42,13 @@ var defaultParallelizationWidth: Int {
/// items do not start running; they must wait until the suspended work item
/// either returns or throws an error.
///
/// The generic type parameter `T` is unused. It avoids warnings when multiple
/// copies of the testing library are loaded into a runner process on platforms
/// which use the Objective-C runtime, due to non-generic actor types being
/// implemented as classes there.
///
/// This type is not part of the public interface of the testing library.
final actor Serializer {
final actor Serializer<T> {
/// The maximum number of work items that may run concurrently.
nonisolated let maximumWidth: Int

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