WIP

Author: tshortli

test/Sema/extension_retroactive_conformances_underlying_clang_module.swift

@@ -1,7 +1,8 @@
 // RUN: %empty-directory(%t)
 // RUN: split-file %s %t
 // RUN: %target-swift-frontend -swift-version 5 %t/OtherLibrary.swift -emit-module -module-name OtherLibrary -o %t
-// RUN: %target-swift-frontend -typecheck %t/Library.swift -module-name Library -verify -swift-version 5 -I %t
+// RUN: %target-swift-frontend -typecheck %t/Library.swift -module-name Library -verify -swift-version 5 -import-underlying-module -I %t
+// RUN: %target-swift-frontend -typecheck %t/Library.swift -module-name Library -verify -swift-version 5 -DEXPLICIT_IMPORT -I %t
 
 // REQUIRES: objc_interop
 
@@ -28,7 +29,9 @@ public protocol OtherLibraryProtocol {}
 
 //--- Library.swift
 
+#if EXPLICIT_IMPORT
 @_exported import Library
+#endif
 import OtherLibrary
 
 public class LibraryClass {}