Availability Bounds for Parameterized Existential Runtime Metadata Functions

Author: CodaFi

include/swift/AST/ASTContext.h

@@ -868,6 +868,10 @@ class ASTContext final {
   /// swift_isUniquelyReferenced functions.
   AvailabilityContext getObjCIsUniquelyReferencedAvailability();
 
+  /// Get the runtime availability of metadata manipulation runtime functions
+  /// for extended existential types.
+  AvailabilityContext getParameterizedExistentialRuntimeAvailability();
+
   /// Get the runtime availability of features introduced in the Swift 5.2
   /// compiler for the target platform.
   AvailabilityContext getSwift52Availability();

lib/AST/Availability.cpp

@@ -394,6 +394,11 @@ AvailabilityContext ASTContext::getObjCIsUniquelyReferencedAvailability() {
   return getSwift56Availability();
 }
 
+AvailabilityContext
+ASTContext::getParameterizedExistentialRuntimeAvailability() {
+  return getSwift57Availability();
+}
+
 AvailabilityContext ASTContext::getSwift52Availability() {
   auto target = LangOpts.Target;