Enum with interface keywords leads to fail in DeclarationChecker

compiler/frontend/src/org/jetbrains/kotlin/resolve/DeclarationsChecker.java

@@ -635,10 +635,6 @@ public class DeclarationsChecker {
     }
 
     private void checkEnumEntry(@NotNull JetEnumEntry enumEntry, @NotNull ClassDescriptor classDescriptor) {
-        DeclarationDescriptor declaration = classDescriptor.getContainingDeclaration();
-        assert DescriptorUtils.isEnumClass(declaration) : "Enum entry should be declared in enum class: " + classDescriptor;
-        ClassDescriptor enumClass = (ClassDescriptor) declaration;
-
         if (enumEntryUsesDeprecatedSuperConstructor(enumEntry)) {
             trace.report(Errors.ENUM_ENTRY_USES_DEPRECATED_SUPER_CONSTRUCTOR.on(enumEntry, classDescriptor));
         }
@@ -650,23 +646,34 @@ public class DeclarationsChecker {
             trace.report(Errors.ENUM_ENTRY_AFTER_ENUM_MEMBER.on(enumEntry, classDescriptor));
         }
 
-        List<JetDelegationSpecifier> delegationSpecifiers = enumEntry.getDelegationSpecifiers();
-        ConstructorDescriptor constructor = enumClass.getUnsubstitutedPrimaryConstructor();
-        if ((constructor == null || !constructor.getValueParameters().isEmpty()) && delegationSpecifiers.isEmpty()) {
-            trace.report(ENUM_ENTRY_SHOULD_BE_INITIALIZED.on(enumEntry, enumClass));
-        }
+        DeclarationDescriptor declaration = classDescriptor.getContainingDeclaration();
+        if (DescriptorUtils.isEnumClass(declaration)) {
+            ClassDescriptor enumClass = (ClassDescriptor) declaration;
 
-        for (JetDelegationSpecifier delegationSpecifier : delegationSpecifiers) {
-            JetTypeReference typeReference = delegationSpecifier.getTypeReference();
-            if (typeReference != null) {
-                JetType type = trace.getBindingContext().get(TYPE, typeReference);
-                if (type != null) {
-                    JetType enumType = enumClass.getDefaultType();
-                    if (!type.getConstructor().equals(enumType.getConstructor())) {
-                        trace.report(ENUM_ENTRY_ILLEGAL_TYPE.on(typeReference, enumClass));
+            List<JetDelegationSpecifier> delegationSpecifiers = enumEntry.getDelegationSpecifiers();
+            ConstructorDescriptor constructor = enumClass.getUnsubstitutedPrimaryConstructor();
+            if ((constructor == null || !constructor.getValueParameters().isEmpty()) && delegationSpecifiers.isEmpty()) {
+                trace.report(ENUM_ENTRY_SHOULD_BE_INITIALIZED.on(enumEntry, enumClass));
+            }
+
+            for (JetDelegationSpecifier delegationSpecifier : delegationSpecifiers) {
+                JetTypeReference typeReference = delegationSpecifier.getTypeReference();
+                if (typeReference != null) {
+                    JetType type = trace.getBindingContext().get(TYPE, typeReference);
+                    if (type != null) {
+                        JetType enumType = enumClass.getDefaultType();
+                        if (!type.getConstructor().equals(enumType.getConstructor())) {
+                            trace.report(ENUM_ENTRY_ILLEGAL_TYPE.on(typeReference, enumClass));
+                        }
                     }
                 }
             }
         }
+        else {
+            assert DescriptorUtils.isTrait(declaration) : "Enum entry should be declared in enum class: " +
+                                                          classDescriptor + " " +
+                                                          classDescriptor.getKind();
+        }
     }
+
 }

compiler/testData/diagnostics/tests/enum/interfaceWithEnumKeyword.kt

@@ -0,0 +1,8 @@
+<!ILLEGAL_ENUM_ANNOTATION!>enum<!> interface Some {
+    // Enum part
+    <!ABSTRACT_MEMBER_NOT_IMPLEMENTED, ENUM_ENTRY_USES_DEPRECATED_OR_NO_DELIMITER!>D<!>
+
+    // Interface like part
+    fun test()
+    val foo: Int
+}

compiler/testData/diagnostics/tests/enum/interfaceWithEnumKeyword.txt

@@ -0,0 +1,18 @@
+package
+
+internal interface Some {
+    public enum entry D : Some {
+        private constructor D()
+        internal abstract override /*1*/ /*fake_override*/ val foo: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        internal abstract override /*1*/ /*fake_override*/ fun test(): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    internal abstract val foo: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    internal abstract fun test(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/psi/EnumWithAnnotationKeyword.kt

@@ -1,3 +1,7 @@
 data annotation enum class E {
     D
+}
+
+enum annotation E1 {
+    D
 }

compiler/testData/psi/EnumWithAnnotationKeyword.txt

@@ -32,4 +32,32 @@ JetFile: EnumWithAnnotationKeyword.kt
         OBJECT_DECLARATION_NAME
           PsiElement(IDENTIFIER)('D')
       PsiWhiteSpace('\n')
+      PsiElement(RBRACE)('}')
+  PsiWhiteSpace('\n\n')
+  FUN
+    MODIFIER_LIST
+      PsiElement(enum)('enum')
+      PsiWhiteSpace(' ')
+      ANNOTATION_ENTRY
+        CONSTRUCTOR_CALLEE
+          TYPE_REFERENCE
+            USER_TYPE
+              REFERENCE_EXPRESSION
+                PsiElement(IDENTIFIER)('annotation')
+      PsiWhiteSpace(' ')
+      ANNOTATION_ENTRY
+        CONSTRUCTOR_CALLEE
+          TYPE_REFERENCE
+            USER_TYPE
+              REFERENCE_EXPRESSION
+                PsiElement(IDENTIFIER)('E1')
+    PsiErrorElement:Expecting a top level declaration
+      <empty list>
+    PsiWhiteSpace(' ')
+    BLOCK
+      PsiElement(LBRACE)('{')
+      PsiWhiteSpace('\n    ')
+      REFERENCE_EXPRESSION
+        PsiElement(IDENTIFIER)('D')
+      PsiWhiteSpace('\n')
       PsiElement(RBRACE)('}')

compiler/testData/psi/InterfaceWithEnumKeyword.kt

@@ -4,4 +4,8 @@ enum interface class E1 {
 
 interface enum class E2 {
     D
+}
+
+enum interface E3 {
+    D
 }

compiler/testData/psi/InterfaceWithEnumKeyword.txt

@@ -54,4 +54,21 @@ JetFile: InterfaceWithEnumKeyword.kt
       PsiErrorElement:Expecting member declaration
         <empty list>
       PsiWhiteSpace('\n')
+      PsiElement(RBRACE)('}')
+  PsiWhiteSpace('\n\n')
+  CLASS
+    MODIFIER_LIST
+      PsiElement(enum)('enum')
+    PsiWhiteSpace(' ')
+    PsiElement(interface)('interface')
+    PsiWhiteSpace(' ')
+    PsiElement(IDENTIFIER)('E3')
+    PsiWhiteSpace(' ')
+    CLASS_BODY
+      PsiElement(LBRACE)('{')
+      PsiWhiteSpace('\n    ')
+      ENUM_ENTRY
+        OBJECT_DECLARATION_NAME
+          PsiElement(IDENTIFIER)('D')
+      PsiWhiteSpace('\n')
       PsiElement(RBRACE)('}')

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

@@ -5193,6 +5193,12 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("interfaceWithEnumKeyword.kt")
+            public void testInterfaceWithEnumKeyword() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/enum/interfaceWithEnumKeyword.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("isEnumEntry.kt")
             public void testIsEnumEntry() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/enum/isEnumEntry.kt");