SE-495: Make @c an official feature

xymus · xymus · commit 000c2604b05e · 2025-10-29T11:55:41.000-07:00
diff --git a/include/swift/AST/DiagnosticsSema.def b/include/swift/AST/DiagnosticsSema.def
@@ -2114,9 +2114,6 @@ ERROR(cdecl_throws,none,
 ERROR(cdecl_incompatible_with_objc,none,
       "cannot apply both '@c' and '@objc' to %kindonly0",
       (const Decl *))
-ERROR(cdecl_feature_required,none,
-      "'@c' requires '-enable-experimental-feature CDecl'",
-      ())
 
 // @used and @section
 ERROR(section_empty_name,none,
diff --git a/include/swift/Basic/Features.def b/include/swift/Basic/Features.def
@@ -277,6 +277,7 @@ LANGUAGE_FEATURE(LifetimeDependenceMutableAccessors, 0, "Support mutable accesso
 LANGUAGE_FEATURE(InoutLifetimeDependence, 0, "Support @_lifetime(&)")
 SUPPRESSIBLE_LANGUAGE_FEATURE(NonexhaustiveAttribute, 487, "Nonexhaustive Enums")
 LANGUAGE_FEATURE(ModuleSelector, 491, "Module selectors (`Module::name` syntax)")
+LANGUAGE_FEATURE(CDecl, 495, "C compatible functions and enums with @c")
 
 // Swift 6
 UPCOMING_FEATURE(ConciseMagicFile, 274, 6)
@@ -529,9 +530,6 @@ EXPERIMENTAL_FEATURE(ClosureBodyMacro, true)
 /// Allow declarations of Swift runtime symbols using @_silgen_name.
 EXPERIMENTAL_FEATURE(AllowRuntimeSymbolDeclarations, true)
 
-/// Allow use of `@c`
-EXPERIMENTAL_FEATURE(CDecl, false)
-
 /// Allow use of `using` declaration that control default isolation
 /// in a file scope.
 EXPERIMENTAL_FEATURE(DefaultIsolationPerFile, false)
diff --git a/lib/Sema/TypeCheckAttr.cpp b/lib/Sema/TypeCheckAttr.cpp
@@ -2486,12 +2486,6 @@ void AttributeChecker::visitCDeclAttr(CDeclAttr *attr) {
   if (D->getAttrs().getAttribute<ObjCAttr>()) {
     diagnose(attr->getLocation(), diag::cdecl_incompatible_with_objc, D);
   }
-
-  // @c needs to be enabled via a feature flag.
-  if (!attr->Underscored &&
-      !Ctx.LangOpts.hasFeature(Feature::CDecl)) {
-    diagnose(attr->getLocation(), diag::cdecl_feature_required);
-  }
 }
 
 void AttributeChecker::visitExposeAttr(ExposeAttr *attr) {
diff --git a/test/Interop/CxxToSwiftToCxx/bridge-cxx-struct-back-to-cxx.swift b/test/Interop/CxxToSwiftToCxx/bridge-cxx-struct-back-to-cxx.swift
@@ -181,6 +181,7 @@ public struct Strct {
     public let transform2: ns.anonStructInNS
 }
 
+// CHECK: #if __has_feature(objc_modules)
 // CHECK: #if __has_feature(objc_modules)
 // CHECK: #if __has_feature(objc_modules)
 // CHECK-NEXT: #if __has_warning("-Watimport-in-framework-header")
diff --git a/test/Parse/objc_enum.swift b/test/Parse/objc_enum.swift
@@ -26,7 +26,7 @@ enum NonObjCEnum: Int {
 
 class Bar {
   @objc func foo(x: Foo) {}
-  @objc func nonObjC(x: NonObjCEnum) {} //expected-error{{type of the parameter cannot be represented in Objective-C}} //expected-note{{non-'@objc' enums cannot be represented in Objective-C}}
+  @objc func nonObjC(x: NonObjCEnum) {} //expected-error{{type of the parameter cannot be represented in Objective-C}} //expected-note{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
 }
 
 // <rdar://problem/23681566> @objc enums with payloads rejected with no source location info
diff --git a/test/PrintAsObjC/emit-clang-header-nonmodular-includes-mock-sdk.swift b/test/PrintAsObjC/emit-clang-header-nonmodular-includes-mock-sdk.swift
@@ -24,6 +24,7 @@ public class HelloWorld: NSObject {
   }
 }
 
+// CHECK:      #if __has_feature(objc_modules)
 // CHECK:      #if __has_feature(objc_modules)
 // CHECK-NEXT: #if __has_warning("-Watimport-in-framework-header")
 // CHECK-NEXT: #pragma clang diagnostic ignored "-Watimport-in-framework-header"
diff --git a/test/PrintAsObjC/emit-clang-header-nonmodular-includes-modulemap-not-in-include-dir.swift b/test/PrintAsObjC/emit-clang-header-nonmodular-includes-modulemap-not-in-include-dir.swift
@@ -11,6 +11,7 @@ import EmitClangHeaderNonmodularIncludesStressTest
 
 public class Bar : Baz {}
 
+// CHECK:      #if __has_feature(objc_modules)
 // CHECK:      #if __has_feature(objc_modules)
 // CHECK-NEXT: #if __has_warning("-Watimport-in-framework-header")
 // CHECK-NEXT: #pragma clang diagnostic ignored "-Watimport-in-framework-header"
diff --git a/test/PrintAsObjC/emit-clang-header-nonmodular-includes-path-normalization.swift b/test/PrintAsObjC/emit-clang-header-nonmodular-includes-path-normalization.swift
@@ -9,6 +9,7 @@ import EmitClangHeaderNonmodularIncludesStressTest
 
 public class Bar : Baz {}
 
+// CHECK:      #if __has_feature(objc_modules)
 // CHECK:      #if __has_feature(objc_modules)
 // CHECK-NEXT: #if __has_warning("-Watimport-in-framework-header")
 // CHECK-NEXT: #pragma clang diagnostic ignored "-Watimport-in-framework-header"
diff --git a/test/PrintAsObjC/emit-clang-header-nonmodular-includes-symlinked-header.swift b/test/PrintAsObjC/emit-clang-header-nonmodular-includes-symlinked-header.swift
@@ -11,6 +11,7 @@ import EmitClangHeaderNonmodularIncludesStressTest
 public class Bar : Foo {}
 
 
+// CHECK:      #if __has_feature(objc_modules)
 // CHECK:      #if __has_feature(objc_modules)
 // CHECK-NEXT: #if __has_warning("-Watimport-in-framework-header")
 // CHECK-NEXT: #pragma clang diagnostic ignored "-Watimport-in-framework-header"
diff --git a/test/PrintAsObjC/empty.swift b/test/PrintAsObjC/empty.swift
@@ -41,6 +41,13 @@
 // CHECK-NEXT: #endif
 // CHECK-NEXT: #endif
 
+// CHECK: #if defined(__cplusplus)
+// CHECK-NEXT: extern "C" {
+// CHECK-NEXT: #endif
+
+// CHECK: #if defined(__cplusplus)
+// CHECK-NEXT: } // extern "C"
+// CHECK-NEXT: #endif
 
 // CHECK-NOT: {{[@;{}]}}
 
diff --git a/test/PrintAsObjC/enums.swift b/test/PrintAsObjC/enums.swift
@@ -2,14 +2,14 @@
 
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -enable-source-import -emit-module -emit-module-doc -o %t %s -import-objc-header %S/Inputs/enums.h -disable-objc-attr-requires-foundation-module
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -parse-as-library %t/enums.swiftmodule -typecheck -verify -emit-objc-header-path %t/enums.h -import-objc-header %S/Inputs/enums.h -disable-objc-attr-requires-foundation-module
-// RUN: %FileCheck %s < %t/enums.h
+// RUN: %FileCheck %s -input-file %t/enums.h
 // RUN: %FileCheck -check-prefix=NEGATIVE %s < %t/enums.h
 // RUN: %check-in-clang %t/enums.h
 // RUN: %check-in-clang -fno-modules -Qunused-arguments %t/enums.h -include ctypes.h -include CoreFoundation.h
 
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -enable-source-import -emit-module -o /dev/null -emit-module-doc-path /dev/null -module-name enums %s -emit-objc-header-path %t/enums.WMO.h -import-objc-header %S/Inputs/enums.h -disable-objc-attr-requires-foundation-module
-// RUN: %FileCheck %s < %t/enums.WMO.h
-// RUN: %FileCheck -check-prefix=NEGATIVE %s < %t/enums.WMO.h
+// RUN: %FileCheck %s -input-file %t/enums.WMO.h
+// RUN: %FileCheck -check-prefix=NEGATIVE %s -input-file %t/enums.WMO.h
 // RUN: %check-in-clang %t/enums.WMO.h
 // RUN: %check-in-clang -fno-modules -Qunused-arguments %t/enums.WMO.h -include ctypes.h -include CoreFoundation.h
 
@@ -18,20 +18,20 @@
 
 // RUN: echo "{\"%s\": {\"objc-header\": \"%t/enums-supplemental.h\"}}" > %t-output-file-map.json
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -parse-as-library %s -enable-source-import -typecheck -verify -supplementary-output-file-map %t-output-file-map.json -import-objc-header %S/Inputs/enums.h -disable-objc-attr-requires-foundation-module
-// RUN: %FileCheck -check-prefix CHECK-SUPPLEMENTAL %s < %t/enums-supplemental.h
+// RUN: %FileCheck -check-prefix CHECK-SUPPLEMENTAL %s -input-file %t/enums-supplemental.h
 
 // REQUIRES: objc_interop
 
 import Foundation
 
 // NEGATIVE-NOT: NSMalformedEnumMissingTypedef :
 // NEGATIVE-NOT: enum EnumNamed
-// CHECK-LABEL: enum FooComments : NSInteger;
-// CHECK-LABEL: enum NegativeValues : int16_t;
-// CHECK-LABEL: enum ObjcEnumNamed : NSInteger;
+// CHECK-LABEL: typedef SWIFT_ENUM_FWD_DECL(NSInteger, FooComments)
+// CHECK-LABEL: typedef SWIFT_ENUM_FWD_DECL(int16_t, NegativeValues)
+// CHECK-LABEL: typedef SWIFT_ENUM_FWD_DECL(NSInteger, ObjcEnumNamed)
 
-// CHECK-SUPPLEMENTAL: enum NegativeValues : int16_t;
-// CHECK-SUPPLEMENTAL: enum ObjcEnumNamed : NSInteger;
+// CHECK-SUPPLEMENTAL: typedef SWIFT_ENUM_FWD_DECL(int16_t, NegativeValues)
+// CHECK-SUPPLEMENTAL: typedef SWIFT_ENUM_FWD_DECL(NSInteger, ObjcEnumNamed)
 
 // CHECK-LABEL: @interface AnEnumMethod
 // CHECK-NEXT: - (enum NegativeValues)takeAndReturnEnum:(enum FooComments)foo SWIFT_WARN_UNUSED_RESULT;
diff --git a/test/PrintAsObjC/mixed-framework-fwd.swift b/test/PrintAsObjC/mixed-framework-fwd.swift
@@ -17,7 +17,8 @@
 
 // REQUIRES: objc_interop
 
-// CHECK-LABEL: #if __has_feature(objc_modules)
+// CHECK: #if __has_feature(objc_modules)
+// CHECK: #if __has_feature(objc_modules)
 // CHECK-NEXT: #if __has_warning
 // CHECK-NEXT: #pragma clang diagnostic
 // CHECK-NEXT: #endif
diff --git a/test/PrintAsObjC/mixed-framework.swift b/test/PrintAsObjC/mixed-framework.swift
@@ -12,7 +12,8 @@
 
 // CHECK: #pragma clang diagnostic push
 
-// CHECK-LABEL: #if __has_feature(objc_modules)
+// CHECK: #if __has_feature(objc_modules)
+// CHECK: #if __has_feature(objc_modules)
 // CHECK-NEXT: #if __has_warning("-Watimport-in-framework-header")
 // CHECK-NEXT: #pragma clang diagnostic ignored "-Watimport-in-framework-header"
 // CHECK-NEXT: #endif
diff --git a/test/Sema/objc_property_wrappers.swift b/test/Sema/objc_property_wrappers.swift
@@ -75,7 +75,7 @@ public struct WrapperStruct {
 class EnumCase {
     @objc
     func foo(@WrapperEnum _ ref: Int) throws {} // expected-error {{method cannot be marked '@objc' because the type of the parameter cannot be represented in Objective-C}}
-    // expected-note@-1 {{non-'@objc' enums cannot be represented in Objective-C}}
+    // expected-note@-1 {{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
 }
 
 @propertyWrapper
diff --git a/test/attr/attr_cdecl.swift b/test/attr/attr_cdecl.swift
@@ -31,7 +31,7 @@ enum UnderscoreCDeclEnum: CInt { case A, B }
 func swiftStruct(x: SwiftStruct) {} // expected-error{{cannot be represented}} expected-note{{Swift struct}}
 
 @_cdecl("swiftEnum")
-func swiftEnum(x: SwiftEnum) {} // expected-error{{cannot be represented}} expected-note{{non-'@objc' enum}}
+func swiftEnum(x: SwiftEnum) {} // expected-error{{cannot be represented}} expected-note{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
 
 @_cdecl("cEnum")
 func cEnum(x: CEnum) {}
diff --git a/test/attr/attr_cdecl_official_rejected.swift b/test/attr/attr_cdecl_official_rejected.swift
@@ -1,12 +1,9 @@
 // RUN: %target-typecheck-verify-swift
-// RUN: %target-swift-frontend -typecheck %s \
-// RUN:   -enable-experimental-feature CDecl
+// RUN: %target-swift-frontend -typecheck %s
 
-// REQUIRES: swift_feature_CDecl
-
-@c(cdecl_foo) func foo() { } // expected-error {{'@c' requires '-enable-experimental-feature CDecl'}}
+@c(cdecl_foo) func foo() { }
 
 var computed: Int {
-  @c(get_computed) get { return 0 } // expected-error {{'@c' requires '-enable-experimental-feature CDecl'}}
-  @c(set_computed) set { } // expected-error {{'@c' requires '-enable-experimental-feature CDecl'}}
+  @c(get_computed) get { return 0 }
+  @c(set_computed) set { }
 }
diff --git a/test/attr/attr_ibaction.swift b/test/attr/attr_ibaction.swift
@@ -142,7 +142,7 @@ extension String: @retroactive _ObjectiveCBridgeable {
 
   // Other bad cases
   @IBAction func action30(_: S) {} // expected-error{{method cannot be marked '@IBAction' because the type of the parameter cannot be represented in Objective-C}} expected-note{{Swift structs cannot be represented in Objective-C}}
-  @IBAction func action31(_: E) {} // expected-error{{method cannot be marked '@IBAction' because the type of the parameter cannot be represented in Objective-C}} expected-note{{non-'@objc' enums cannot be represented in Objective-C}}
+  @IBAction func action31(_: E) {} // expected-error{{method cannot be marked '@IBAction' because the type of the parameter cannot be represented in Objective-C}} expected-note{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
 
   init() { }
 }
diff --git a/test/attr/attr_ibsegueaction.swift b/test/attr/attr_ibsegueaction.swift
@@ -224,10 +224,10 @@ protocol CP2 : class { }
   @IBSegueAction func action30c(_: AnyObject, _: S, _: AnyObject) -> AnyObject {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because the type of the parameter 2 cannot be represented in Objective-C}} expected-note{{Swift structs cannot be represented in Objective-C}}
   @IBSegueAction func action30d(_: AnyObject, _: AnyObject, _: S) -> AnyObject {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because the type of the parameter 3 cannot be represented in Objective-C}} expected-note{{Swift structs cannot be represented in Objective-C}}
 
-  @IBSegueAction func action31a(_: AnyObject, _: AnyObject, _: AnyObject) -> E {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because its result type cannot be represented in Objective-C}} expected-note{{non-'@objc' enums cannot be represented in Objective-C}}
-  @IBSegueAction func action31b(_: E, _: AnyObject, _: AnyObject) -> AnyObject {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because the type of the parameter 1 cannot be represented in Objective-C}} expected-note{{non-'@objc' enums cannot be represented in Objective-C}}
-  @IBSegueAction func action31c(_: AnyObject, _: E, _: AnyObject) -> AnyObject {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because the type of the parameter 2 cannot be represented in Objective-C}} expected-note{{non-'@objc' enums cannot be represented in Objective-C}}
-  @IBSegueAction func action31d(_: AnyObject, _: AnyObject, _: E) -> AnyObject {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because the type of the parameter 3 cannot be represented in Objective-C}} expected-note{{non-'@objc' enums cannot be represented in Objective-C}}
+  @IBSegueAction func action31a(_: AnyObject, _: AnyObject, _: AnyObject) -> E {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because its result type cannot be represented in Objective-C}} expected-note{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
+  @IBSegueAction func action31b(_: E, _: AnyObject, _: AnyObject) -> AnyObject {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because the type of the parameter 1 cannot be represented in Objective-C}} expected-note{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
+  @IBSegueAction func action31c(_: AnyObject, _: E, _: AnyObject) -> AnyObject {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because the type of the parameter 2 cannot be represented in Objective-C}} expected-note{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
+  @IBSegueAction func action31d(_: AnyObject, _: AnyObject, _: E) -> AnyObject {fatalError()} // expected-error{{method cannot be marked '@IBSegueAction' because the type of the parameter 3 cannot be represented in Objective-C}} expected-note{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
 
   // Supported arities
   @IBSegueAction func actionWith0() -> X {fatalError()} // expected-error{{@IBSegueAction methods must have 1 to 3 arguments}}
diff --git a/test/attr/attr_objc.swift b/test/attr/attr_objc.swift
@@ -639,7 +639,7 @@ class subject_subscriptInvalid4 {
 class subject_subscriptInvalid5 {
   @objc // bad-access-note-move{{subject_subscriptInvalid5.subscript(_:)}}
   subscript(a: PlainEnum) -> Int { // access-note-adjust{{@objc}} expected-error {{subscript cannot be marked '@objc' because its type cannot be represented in Objective-C}}
-    // expected-note@-1{{enums cannot be represented in Objective-C}}
+    // expected-note@-1{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
     get { return 0 }
   }
 }
@@ -765,7 +765,7 @@ class infer_instanceFunc1 {
   @objc // bad-access-note-move{{infer_instanceFunc1.func11_(a:)}}
   func func11_(a: PlainEnum) {}
   // access-note-adjust{{@objc}} expected-error@-1 {{instance method cannot be marked '@objc' because the type of the parameter cannot be represented in Objective-C}}
-  // expected-note@-2 {{non-'@objc' enums cannot be represented in Objective-C}}
+  // expected-note@-2{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
 
   func func12(a: PlainProtocol) {}
 // CHECK-LABEL: {{^}} func func12(a: any PlainProtocol) {
@@ -881,7 +881,7 @@ class infer_instanceFunc1 {
   // access-note-adjust{{@objc}} expected-error@-1 {{instance method cannot be marked '@objc' because the type of the parameter 1 cannot be represented in Objective-C}}
   // expected-note@-2 {{Swift structs cannot be represented in Objective-C}}
   // access-note-adjust{{@objc}} expected-error@-3 {{instance method cannot be marked '@objc' because the type of the parameter 2 cannot be represented in Objective-C}}
-  // expected-note@-4 {{non-'@objc' enums cannot be represented in Objective-C}}
+  // expected-note@-4{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
   // Produces an extra: expected-note@-5 * {{attribute 'objc' was added by access note for fancy tests}}
 
   @objc // access-note-move{{infer_instanceFunc1.func_UnnamedParam1(_:)}}
@@ -1101,7 +1101,7 @@ class infer_instanceVar1 {
   @objc // bad-access-note-move{{infer_instanceVar1.var_PlainEnum_}}
   var var_PlainEnum_: PlainEnum
   // access-note-adjust{{@objc}} expected-error@-1 {{property cannot be marked '@objc' because its type cannot be represented in Objective-C}}
-  // expected-note@-2 {{non-'@objc' enums cannot be represented in Objective-C}}
+  // expected-note@-2{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
 
   var var_PlainProtocol: PlainProtocol
 // CHECK-LABEL: {{^}}  var var_PlainProtocol: any PlainProtocol
@@ -2322,7 +2322,7 @@ class ClassThrows1 {
   @objc // bad-access-note-move{{ClassThrows1.fooWithErrorEnum1(x:)}}
   func fooWithErrorEnum1(x: ErrorEnum) {}
   // access-note-adjust{{@objc}} expected-error@-1{{instance method cannot be marked '@objc' because the type of the parameter cannot be represented in Objective-C}}
-  // expected-note@-2{{non-'@objc' enums cannot be represented in Objective-C}}
+  // expected-note@-2{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}
 
   // CHECK: {{^}} func fooWithErrorEnum2(x: ErrorEnum)
   func fooWithErrorEnum2(x: ErrorEnum) {}

Original file line number	Diff line number	Diff line change
`@@ -2486,12 +2486,6 @@ void AttributeChecker::visitCDeclAttr(CDeclAttr *attr) {`
`2486`	`2486`	`if (D->getAttrs().getAttribute<ObjCAttr>()) {`
`2487`	`2487`	`diagnose(attr->getLocation(), diag::cdecl_incompatible_with_objc, D);`
`2488`	`2488`	`}`
`2489`		`-`
`2490`		`- // @c needs to be enabled via a feature flag.`
`2491`		`- if (!attr->Underscored &&`
`2492`		`- !Ctx.LangOpts.hasFeature(Feature::CDecl)) {`
`2493`		`- diagnose(attr->getLocation(), diag::cdecl_feature_required);`
`2494`		`- }`
`2495`	`2489`	`}`
`2496`	`2490`
`2497`	`2491`	`void AttributeChecker::visitExposeAttr(ExposeAttr *attr) {`
Original file line number	Diff line number	Diff line change
`@@ -181,6 +181,7 @@ public struct Strct {`
`181`	`181`	`public let transform2: ns.anonStructInNS`
`182`	`182`	`}`
`183`	`183`
	`184`	`+// CHECK: #if __has_feature(objc_modules)`
`184`	`185`	`// CHECK: #if __has_feature(objc_modules)`
`185`	`186`	`// CHECK: #if __has_feature(objc_modules)`
`186`	`187`	`// CHECK-NEXT: #if __has_warning("-Watimport-in-framework-header")`
Original file line number	Diff line number	Diff line change
`@@ -26,7 +26,7 @@ enum NonObjCEnum: Int {`
`26`	`26`
`27`	`27`	`class Bar {`
`28`	`28`	`@objc func foo(x: Foo) {}`
`29`		`- @objc func nonObjC(x: NonObjCEnum) {} //expected-error{{type of the parameter cannot be represented in Objective-C}} //expected-note{{non-'@objc' enums cannot be represented in Objective-C}}`
	`29`	`+ @objc func nonObjC(x: NonObjCEnum) {} //expected-error{{type of the parameter cannot be represented in Objective-C}} //expected-note{{Swift enums not marked '@c' or '@objc' cannot be represented in Objective-C}}`
`30`	`30`	`}`
`31`	`31`
`32`	`32`	`// <rdar://problem/23681566> @objc enums with payloads rejected with no source location info`
Original file line number	Diff line number	Diff line change
`@@ -24,6 +24,7 @@ public class HelloWorld: NSObject {`
`24`	`24`	`}`
`25`	`25`	`}`
`26`	`26`
	`27`	`+// CHECK: #if __has_feature(objc_modules)`
`27`	`28`	`// CHECK: #if __has_feature(objc_modules)`
`28`	`29`	`// CHECK-NEXT: #if __has_warning("-Watimport-in-framework-header")`
`29`	`30`	`// CHECK-NEXT: #pragma clang diagnostic ignored "-Watimport-in-framework-header"`