[K/N] Implement objc export header test: functionWithErrorType

kotlin-native/backend.native/functionalTest/src/org/jetbrains/kotlin/backend/konan/tests/Fe10ObjCExportHeaderGeneratorTest.kt

@@ -102,4 +102,9 @@ class Fe10ObjCExportHeaderGeneratorTest : AbstractFE10ObjCExportHeaderGeneratorT
     fun `test - functionWithThrowsAnnotation`() {
         doTest(objCExportTestDataDir.resolve("functionWithThrowsAnnotation"))
     }
+
+    @Test
+    fun `test - functionWithErrorType`() {
+        doTest(objCExportTestDataDir.resolve("functionWithErrorType"))
+    }
 }

kotlin-native/backend.native/functionalTest/testData/objcexport/functionWithErrorType/!functionWithErrorType.h

@@ -0,0 +1,33 @@
+#import <Foundation/NSArray.h>
+#import <Foundation/NSDictionary.h>
+#import <Foundation/NSError.h>
+#import <Foundation/NSObject.h>
+#import <Foundation/NSSet.h>
+#import <Foundation/NSString.h>
+#import <Foundation/NSValue.h>
+
+@class ERROR;
+
+NS_ASSUME_NONNULL_BEGIN
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-warning-option"
+#pragma clang diagnostic ignored "-Wincompatible-property-type"
+#pragma clang diagnostic ignored "-Wnullability"
+
+#pragma push_macro("_Nullable_result")
+#if !__has_feature(nullability_nullable_result)
+#undef _Nullable_result
+#define _Nullable_result _Nullable
+#endif
+
+__attribute__((objc_subclassing_restricted))
+@interface FooKt : Base
++ (ERROR *)foo __attribute__((swift_name("foo()")));
+@end
+
+@interface ERROR : Base
+@end
+
+#pragma pop_macro("_Nullable_result")
+#pragma clang diagnostic pop
+NS_ASSUME_NONNULL_END

kotlin-native/backend.native/functionalTest/testData/objcexport/functionWithErrorType/Foo.kt

@@ -0,0 +1 @@
+fun foo() = Unresolved