// swift-interface-format-version: 1.0
// swift-compiler-version: Apple Swift version 5.8 (swiftlang-5.8.0.117.59 clang-1403.0.22.8.50)
// swift-module-flags: -target arm64-apple-macosx11 -enable-library-evolution -swift-version 5 -library-level api -module-name Test

// RUN: %target-swift-frontend -typecheck-module-from-interface -verify -module-name Test %s

// REQUIRES: OS=macosx

import Swift

@available(macOS 11, *)
public struct S {}

// This typealias ought to be @available(macOS 11, *) since it references `S`
// and the module was compiled with `-library-level api`. However, given that
// the interface was produced with tools that are older than Swift 5.9 we
// typecheck availability with the deployment target as the floor.
public typealias A = S