diff --git a/include/swift/Basic/Features.def b/include/swift/Basic/Features.def
index e042b97949a74..e5abf45d114dc 100644
--- a/include/swift/Basic/Features.def
+++ b/include/swift/Basic/Features.def
@@ -48,6 +48,7 @@ LANGUAGE_FEATURE(BuiltinExecutor, 0, "Builtin.Executor type", true)
 LANGUAGE_FEATURE(BuiltinContinuation, 0, "Continuation builtins", true)
 LANGUAGE_FEATURE(BuiltinTaskGroup, 0, "TaskGroup builtins", true)
 LANGUAGE_FEATURE(InheritActorContext, 0, "@_inheritActorContext attribute", true)
+LANGUAGE_FEATURE(ImplicitSelfCapture, 0, "@_implicitSelfCapture attribute", true)
 LANGUAGE_FEATURE(BuiltinBuildExecutor, 0, "Executor-building builtins", true)
 
 #undef LANGUAGE_FEATURE
diff --git a/lib/AST/ASTPrinter.cpp b/lib/AST/ASTPrinter.cpp
index 44f3339e4e59e..48c475642e06e 100644
--- a/lib/AST/ASTPrinter.cpp
+++ b/lib/AST/ASTPrinter.cpp
@@ -2776,6 +2776,17 @@ static bool usesFeatureInheritActorContext(Decl *decl) {
   return false;
 }
 
+static bool usesFeatureImplicitSelfCapture(Decl *decl) {
+  if (auto func = dyn_cast<AbstractFunctionDecl>(decl)) {
+    for (auto param : *func->getParameters()) {
+      if (param->getAttrs().hasAttribute<ImplicitSelfCaptureAttr>())
+        return true;
+    }
+  }
+
+  return false;
+}
+
 /// Determine the set of "new" features used on a given declaration.
 ///
 /// Note: right now, all features we check for are "new". At some point, we'll