wording: don't suggest to make enum constant abstract (IDEA-98165)

java/java-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightClassUtil.java

@@ -93,7 +93,7 @@ public class HighlightClassUtil {
     }
     String baseClassName = HighlightUtil.formatClass(aClass, false);
     String methodName = HighlightUtil.formatMethod(abstractMethod);
-    String message = JavaErrorMessages.message("class.must.be.abstract",
+    String message = JavaErrorMessages.message(aClass instanceof PsiEnumConstantInitializer ? "enum.constant.should.implement.method" : "class.must.be.abstract",
                                                baseClassName,
                                                methodName,
                                                HighlightUtil.formatClass(abstractMethod.getContainingClass(), false));

java/java-psi-impl/src/messages/JavaErrorMessages.properties

@@ -95,6 +95,7 @@ implements.after.interface=No implements clause allowed for interface
 extends.after.enum=No extends clause allowed for enum
 static.declaration.in.inner.class=Inner classes cannot have static declarations
 class.must.be.abstract=Class ''{0}'' must either be declared abstract or implement abstract method ''{1}'' in ''{2}''
+enum.constant.should.implement.method=Class ''{0}'' must implement abstract method ''{1}'' in ''{2}''
 abstract.cannot.be.instantiated=''{0}'' is abstract; cannot be instantiated
 duplicate.class.in.other.file=Duplicate class found in the file ''{0}''
 duplicate.class=Duplicate class: ''{0}''

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/EnumWithAbstractMethods.java

@@ -1,5 +1,5 @@
 <error descr="Modifier 'abstract' not allowed here">abstract</error> enum OurEnum {
-  A <error descr="Class 'Anonymous class derived from OurEnum' must either be declared abstract or implement abstract method 'foo()' in 'OurEnum'">{</error>
+  A <error descr="Class 'Anonymous class derived from OurEnum' must implement abstract method 'foo()' in 'OurEnum'">{</error>
   },
   <error descr="'OurEnum' is abstract; cannot be instantiated">B</error>,
   C {
@@ -12,7 +12,7 @@
 
 enum xxx {
   <error descr="'xxx' is abstract; cannot be instantiated">X</error>,
-  Y <error descr="Class 'Anonymous class derived from xxx' must either be declared abstract or implement abstract method 'f()' in 'xxx'">{</error>
+  Y <error descr="Class 'Anonymous class derived from xxx' must implement abstract method 'f()' in 'xxx'">{</error>
   };
 
   abstract void f();