Test that macros can be applied to imported Objective-C declarations

These currently end up as "open", which is incorrect (we need to make them
"final"). This cannot be addressed until we pass the lexical context
down to the macro, which is currently... a bit tricky.

Author: DougGregor

test/Inputs/clang-importer-sdk/usr/include/completion_handler_globals.h

@@ -7,3 +7,14 @@ typedef struct SlowComputer {
 void computer_divide(const SlowComputer *computer, double x, double y, void (* _Nonnull completionHandler)(double x))
   __attribute__((swift_attr("@macro_library.AddAsync")))
   __attribute__((swift_name("SlowComputer.divide(self:_:_:completionHandler:)")));
+
+
+#if __OBJC__
+@import Foundation;
+
+@interface Computer: NSObject
+-(void)multiply:(double)x by:(double)y afterDone:(void (^ _Nonnull)(double x))afterDone
+  __attribute__((swift_attr("@macro_library.AddAsync")))
+  __attribute__((swift_async(none)));
+@end
+#endif

test/Macros/expand_on_imported.swift

@@ -1,4 +1,4 @@
-// REQUIRES: swift_swift_parser, executable_test
+// REQUIRES: swift_swift_parser, executable_test, concurrency
 
 // RUN: %empty-directory(%t)
 // RUN: %host-build-swift -swift-version 5 -emit-library -o %t/%target-library-name(MacroDefinition) -module-name=MacroDefinition %S/Inputs/syntax_macro_definitions.swift -g -no-toolchain-stdlib-rpath -swift-version 5

test/Macros/expand_on_imported_objc.swift

@@ -0,0 +1,21 @@
+// REQUIRES: swift_swift_parser, executable_test, objc_interop, concurrency
+
+// RUN: %empty-directory(%t)
+// RUN: %host-build-swift -swift-version 5 -emit-library -o %t/%target-library-name(MacroDefinition) -module-name=MacroDefinition %S/Inputs/syntax_macro_definitions.swift -g -no-toolchain-stdlib-rpath -swift-version 5
+
+// Build the macro library to give us access to AddAsync.
+// RUN: %target-swift-frontend -swift-version 5 -emit-module -o %t/macro_library.swiftmodule %S/Inputs/macro_library.swift -module-name macro_library -load-plugin-library %t/%target-library-name(MacroDefinition)
+
+// Diagnostics testing
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck -verify -swift-version 5 -enable-experimental-feature CodeItemMacros -load-plugin-library %t/%target-library-name(MacroDefinition) -module-name ModuleUser %s -I %t
+
+import CompletionHandlerGlobals
+import macro_library
+
+@available(SwiftStdlib 5.1, *)
+func testAll(x: Double, y: Double, computer: Computer, untypedComputer: AnyObject) async {
+  let _: Double = await computer.multiply(x, by: y)
+
+  // expected-error@+1{{missing argument for parameter 'afterDone' in call}}
+  untypedComputer.multiply(x, by: y)
+}

test/Macros/print_clang_expand_on_imported.swift

@@ -1,4 +1,4 @@
-// REQUIRES: swift_swift_parser, executable_test
+// REQUIRES: swift_swift_parser, executable_test, concurrency
 
 // RUN: %empty-directory(%t)
 // RUN: %host-build-swift -swift-version 5 -emit-library -o %t/%target-library-name(MacroDefinition) -module-name=MacroDefinition %S/Inputs/syntax_macro_definitions.swift -g -no-toolchain-stdlib-rpath -swift-version 5
@@ -17,4 +17,3 @@ import CompletionHandlerGlobals
 // CHECK: public func divide(_ x: Double, _ y: Double) async -> Double
 
 // CHECK: func async_divide(_ x: Double, _ y: Double) async -> Double
-

test/Macros/print_clang_expand_on_imported_objc.swift

@@ -0,0 +1,16 @@
+// REQUIRES: swift_swift_parser, executable_test, objc_interop, concurrency
+
+// RUN: %empty-directory(%t)
+// RUN: %host-build-swift -swift-version 5 -emit-library -o %t/%target-library-name(MacroDefinition) -module-name=MacroDefinition %S/Inputs/syntax_macro_definitions.swift -g -no-toolchain-stdlib-rpath -swift-version 5
+
+// Build the macro library to give us access to AddAsync.
+// RUN: %target-swift-frontend -swift-version 5 -emit-module -o %t/macro_library.swiftmodule %S/Inputs/macro_library.swift -module-name macro_library -load-plugin-library %t/%target-library-name(MacroDefinition)
+
+// RUN: %target-swift-ide-test(mock-sdk: %clang-importer-sdk) -print-module -print-implicit-attrs -source-filename %s -module-to-print=CompletionHandlerGlobals -I %t -function-definitions=false -load-plugin-library %t/%target-library-name(MacroDefinition) -import-module macro_library > %t/imported.printed.txt
+// RUN: %FileCheck -input-file %t/imported.printed.txt %s
+
+import CompletionHandlerGlobals
+
+// CHECK: class Computer
+// FIXME: The "open" is odd here. We want this to be "final", but can't yet.
+// CHECK: open func multiply(_ x: Double, by y: Double) async -> Double