Local sealed classes are deprecated

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

@@ -127,6 +127,7 @@ public interface Errors {
     DiagnosticFactory1<PsiElement, KtModifierKeywordToken> REPEATED_MODIFIER = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory2<PsiElement, KtModifierKeywordToken, KtModifierKeywordToken> REDUNDANT_MODIFIER = DiagnosticFactory2.create(WARNING);
     DiagnosticFactory2<PsiElement, KtModifierKeywordToken, String> WRONG_MODIFIER_TARGET = DiagnosticFactory2.create(ERROR);
+    DiagnosticFactory2<PsiElement, KtModifierKeywordToken, String> DEPRECATED_MODIFIER_FOR_TARGET = DiagnosticFactory2.create(WARNING);
     DiagnosticFactory2<PsiElement, KtModifierKeywordToken, String> REDUNDANT_MODIFIER_FOR_TARGET = DiagnosticFactory2.create(WARNING);
     DiagnosticFactory2<PsiElement, KtModifierKeywordToken, String> WRONG_MODIFIER_CONTAINING_DECLARATION = DiagnosticFactory2.create(ERROR);
     DiagnosticFactory2<PsiElement, KtModifierKeywordToken, String> DEPRECATED_MODIFIER_CONTAINING_DECLARATION = DiagnosticFactory2.create(WARNING);

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

@@ -129,6 +129,7 @@ public class DefaultErrorMessages {
         MAP.put(DEPRECATED_MODIFIER_PAIR, "Modifier ''{0}'' is deprecated in presence of ''{1}''", TO_STRING, TO_STRING);
         MAP.put(REPEATED_MODIFIER, "Repeated ''{0}''", TO_STRING);
         MAP.put(WRONG_MODIFIER_TARGET, "Modifier ''{0}'' is not applicable to ''{1}''", TO_STRING, TO_STRING);
+        MAP.put(DEPRECATED_MODIFIER_FOR_TARGET, "Modifier ''{0}'' is deprecated for ''{1}''", TO_STRING, TO_STRING);
         MAP.put(REDUNDANT_MODIFIER_FOR_TARGET, "Modifier ''{0}'' is redundant for ''{1}''", TO_STRING, TO_STRING);
         MAP.put(WRONG_MODIFIER_CONTAINING_DECLARATION, "Modifier ''{0}'' is not applicable inside ''{1}''", TO_STRING, TO_STRING);
         MAP.put(DEPRECATED_MODIFIER_CONTAINING_DECLARATION, "Modifier ''{0}'' is deprecated inside ''{1}''", TO_STRING, TO_STRING);

compiler/frontend/src/org/jetbrains/kotlin/resolve/ModifiersChecker.kt

@@ -88,6 +88,12 @@ public object ModifierCheckerCore {
             INFIX_KEYWORD     to EnumSet.of(FUNCTION)
     )
 
+    // NOTE: deprecated targets must be possible!
+    private val deprecatedTargetMap = mapOf<KtModifierKeywordToken, Set<KotlinTarget>>(
+            // Deprecated in 1.0 beta 3
+            SEALED_KEYWORD    to EnumSet.of(LOCAL_CLASS)
+    )
+
     // NOTE: redundant targets must be possible!
     private val redundantTargetMap = mapOf<KtModifierKeywordToken, Set<KotlinTarget>>(
             ABSTRACT_KEYWORD  to EnumSet.of(INTERFACE),
@@ -227,8 +233,12 @@ public object ModifierCheckerCore {
             trace.report(Errors.WRONG_MODIFIER_TARGET.on(node.psi, modifier, actualTargets.firstOrNull()?.description ?: "this"))
             return false
         }
+        val deprecatedTargets = deprecatedTargetMap[modifier] ?: emptySet()
         val redundantTargets = redundantTargetMap[modifier] ?: emptySet()
-        if (actualTargets.any { it in redundantTargets}) {
+        if (actualTargets.any { it in deprecatedTargets }) {
+            trace.report(Errors.DEPRECATED_MODIFIER_FOR_TARGET.on(node.psi, modifier, actualTargets.firstOrNull()?.description ?: "this"))
+        }
+        else if (actualTargets.any { it in redundantTargets }) {
             trace.report(Errors.REDUNDANT_MODIFIER_FOR_TARGET.on(node.psi, modifier, actualTargets.firstOrNull()?.description ?: "this"))
         }
         return true

compiler/testData/diagnostics/tests/sealed/LocalSealed.kt

@@ -0,0 +1,3 @@
+fun foo() {
+    <!DEPRECATED_MODIFIER_FOR_TARGET!>sealed<!> class My
+}

compiler/testData/diagnostics/tests/sealed/LocalSealed.txt

@@ -0,0 +1,3 @@
+package
+
+public fun foo(): kotlin.Unit

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -13989,6 +13989,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("LocalSealed.kt")
+            public void testLocalSealed() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/sealed/LocalSealed.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("NeverConstructed.kt")
             public void testNeverConstructed() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/sealed/NeverConstructed.kt");