[Basic] NFC: Add ExtensibleEnums feature flag

xedin · xedin · commit dac2e98bb956 · 2025-02-22T00:55:09.000-08:00
diff --git a/include/swift/Basic/Features.def b/include/swift/Basic/Features.def
@@ -451,6 +451,11 @@ SUPPRESSIBLE_EXPERIMENTAL_FEATURE(CustomAvailability, true)
 /// Be strict about the Sendable conformance of metatypes.
 EXPERIMENTAL_FEATURE(StrictSendableMetatypes, true)
 
+/// Allow public enumerations to be extensible by default
+/// regardless of whether the module they are declared in
+/// is resilient or not.
+EXPERIMENTAL_FEATURE(ExtensibleEnums, 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
@@ -122,6 +122,7 @@ UNINTERESTING_FEATURE(SuppressedAssociatedTypes)
 UNINTERESTING_FEATURE(StructLetDestructuring)
 UNINTERESTING_FEATURE(MacrosOnImports)
 UNINTERESTING_FEATURE(AsyncCallerExecution)
+UNINTERESTING_FEATURE(ExtensibleEnums)
 
 static bool usesFeatureNonescapableTypes(Decl *decl) {
   auto containsNonEscapable =
