Prohibit using DeprecatedSinceKotlin outside kotlin subpackage

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -104,6 +104,7 @@ public interface Errors {
     DiagnosticFactory0<PsiElement> DEPRECATED_SINCE_KOTLIN_WITH_DEPRECATED_LEVEL = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<PsiElement> DEPRECATED_SINCE_KOTLIN_WITH_UNORDERED_VERSIONS = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<PsiElement> DEPRECATED_SINCE_KOTLIN_WITHOUT_ARGUMENTS = DiagnosticFactory0.create(ERROR);
+    DiagnosticFactory0<PsiElement> DEPRECATED_SINCE_KOTLIN_OUTSIDE_KOTLIN_SUBPACKAGE = DiagnosticFactory0.create(ERROR);
 
     DiagnosticFactory2<PsiElement, String, String> API_NOT_AVAILABLE = DiagnosticFactory2.create(ERROR);
 

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -381,6 +381,7 @@ public class DefaultErrorMessages {
         MAP.put(DEPRECATED_SINCE_KOTLIN_WITH_DEPRECATED_LEVEL, "DeprecatedSinceKotlin annotation can be used only with unspecified deprecation level of Deprecated annotation");
         MAP.put(DEPRECATED_SINCE_KOTLIN_WITH_UNORDERED_VERSIONS, "Values of DeprecatedSinceKotlin annotation should be ordered so 'warningSince' <= 'errorSince' <= 'hiddenSince' if specified");
         MAP.put(DEPRECATED_SINCE_KOTLIN_WITHOUT_ARGUMENTS, "DeprecatedSinceKotlin annotation should have at least one argument");
+        MAP.put(DEPRECATED_SINCE_KOTLIN_OUTSIDE_KOTLIN_SUBPACKAGE, "DeprecatedSinceKotlin annotation cannot be used outside 'kotlin' subpackages");
 
         MAP.put(API_NOT_AVAILABLE, "This declaration is only available since Kotlin {0} and cannot be used with the specified API version {1}", STRING, STRING);
 

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/DeprecatedSinceKotlinAnnotationChecker.kt

@@ -12,12 +12,14 @@ import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.diagnostics.reportDiagnosticOnce
+import org.jetbrains.kotlin.name.isSubpackageOf
 import org.jetbrains.kotlin.psi.KtAnnotationEntry
 import org.jetbrains.kotlin.psi.KtDeclaration
 import org.jetbrains.kotlin.resolve.RequireKotlinConstants
 import org.jetbrains.kotlin.resolve.annotations.argumentValue
 import org.jetbrains.kotlin.resolve.constants.StringValue
 import org.jetbrains.kotlin.resolve.deprecation.getSinceVersion
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameOrNull
 import org.jetbrains.kotlin.resolve.source.getPsi
 import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
@@ -30,6 +32,15 @@ object DeprecatedSinceKotlinAnnotationChecker : DeclarationChecker {
 
         val deprecatedSinceAnnotationName = deprecatedSinceAnnotationPsi.typeReference ?: return
 
+        if (descriptor.fqNameOrNull()?.isSubpackageOf(KotlinBuiltIns.BUILT_INS_PACKAGE_FQ_NAME) == false) {
+            context.trace.report(
+                Errors.DEPRECATED_SINCE_KOTLIN_OUTSIDE_KOTLIN_SUBPACKAGE.on(
+                    deprecatedSinceAnnotationName
+                )
+            )
+            return
+        }
+
         if (deprecatedAnnotation == null) {
             context.trace.report(
                 Errors.DEPRECATED_SINCE_KOTLIN_WITHOUT_DEPRECATED.on(