Fix for invoking abstract method in enum

compiler/backend/src/org/jetbrains/jet/codegen/CodegenUtil.java

@@ -17,7 +17,9 @@
 package org.jetbrains.jet.codegen;
 
 import com.google.common.collect.ImmutableList;
+import com.intellij.openapi.util.Condition;
 import com.intellij.psi.PsiElement;
+import com.intellij.util.containers.ContainerUtil;
 import com.intellij.util.containers.Stack;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -43,6 +45,7 @@ import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
 
 import java.util.*;
 
+import static org.jetbrains.jet.lang.descriptors.Modality.ABSTRACT;
 import static org.jetbrains.jet.lang.resolve.java.AsmTypeConstants.OBJECT_TYPE;
 
 /**
@@ -267,4 +270,17 @@ public class CodegenUtil {
                  (context.getParentContext() instanceof NamespaceContext && context.getParentContext().getContextDescriptor() == containingDeclaration))
                 && context.getContextKind() != OwnerKind.TRAIT_IMPL);
     }
+
+    public static boolean hasAbstractMembers(@NotNull ClassDescriptor classDescriptor) {
+        return ContainerUtil.exists(classDescriptor.getDefaultType().getMemberScope().getAllDescriptors(),
+                new Condition<DeclarationDescriptor>() {
+                    @Override
+                    public boolean value(DeclarationDescriptor declaration) {
+                        if (!(declaration instanceof MemberDescriptor)) {
+                            return false;
+                        }
+                        return ((MemberDescriptor) declaration).getModality() == ABSTRACT;
+                    }
+                });
+}
 }

compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java

@@ -113,6 +113,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
                 signature.getInterfaces().add("java/lang/annotation/Annotation");
             }
             else if (jetClass.hasModifier(JetTokens.ENUM_KEYWORD)) {
+                isAbstract = hasAbstractMembers(descriptor);
                 isEnum = true;
             }
 

compiler/testData/codegen/enum/abstractMethodInEnum.kt

@@ -0,0 +1,9 @@
+enum class A() {
+    ENTRY: A(){ override fun t() = "OK"}
+
+    abstract fun t(): String
+}
+
+fun f(a: A) = a.t()
+
+fun box()= f(A.ENTRY)

compiler/tests/org/jetbrains/jet/codegen/EnumGenTest.java

@@ -171,4 +171,8 @@ public class EnumGenTest extends CodegenTestCase {
     public void testInnerWithExistingClassObject() {
         blackBoxFile("enum/innerWithExistingClassObject.kt");
     }
+
+    public void testAbstractMethodInEnum() {
+        blackBoxFile("enum/abstractMethodInEnum.kt");
+    }
 }