Features: Intro CheckImplementationOnly

xymus · xymus · commit 62ee4486d763 · 2025-11-04T13:50:25.000-08:00
diff --git a/include/swift/Basic/Features.def b/include/swift/Basic/Features.def
@@ -558,6 +558,9 @@ EXPERIMENTAL_FEATURE(EmbeddedExistentials, false)
 /// Allow use of the 'anyAppleOS' availability domain.
 EXPERIMENTAL_FEATURE(AnyAppleOSAvailability, true)
 
+/// Check @_implementationOnly imports in non-library-evolution mode.
+EXPERIMENTAL_FEATURE(CheckImplementationOnly, true)
+
 #undef EXPERIMENTAL_FEATURE_EXCLUDED_FROM_MODULE_INTERFACE
 #undef EXPERIMENTAL_FEATURE
 #undef UPCOMING_FEATURE
diff --git a/lib/AST/FeatureSet.cpp b/lib/AST/FeatureSet.cpp
@@ -144,6 +144,7 @@ UNINTERESTING_FEATURE(ExtractConstantsFromMembers)
 UNINTERESTING_FEATURE(GroupActorErrors)
 UNINTERESTING_FEATURE(SameElementRequirements)
 UNINTERESTING_FEATURE(SendingArgsAndResults)
+UNINTERESTING_FEATURE(CheckImplementationOnly)
 
 static bool findUnderscoredLifetimeAttr(Decl *decl) {
   auto hasUnderscoredLifetimeAttr = [](Decl *decl) {
