check enum synthetic method by erased signatures (IDEA-203732)

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

@@ -873,7 +873,7 @@ public class GenericsHighlightUtil {
     final PsiType javaLangString = PsiType.getJavaLangString(PsiManager.getInstance(project), GlobalSearchScope.allScope(project));
     final MethodSignature valueOfMethod = MethodSignatureUtil.createMethodSignature("valueOf", new PsiType[]{javaLangString}, PsiTypeParameter.EMPTY_ARRAY,
                                                                                     PsiSubstitutor.EMPTY);
-    return valueOfMethod.equals(methodSignature);
+    return MethodSignatureUtil.areSignaturesErasureEqual(valueOfMethod, methodSignature);
   }
 
   @Nullable

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

@@ -38,6 +38,12 @@ enum Operation {
   <error descr="'valueOf(String)' is already defined in 'Operation'">void valueOf(String s)</error> {}
 }
 
+enum enumWithTypeParameterInValueOf {
+  ;
+
+  <error descr="'valueOf(String)' is already defined in 'enumWithTypeParameterInValueOf'">static <T> void valueOf(String s)</error> {}
+}
+
 <error descr="There is no default constructor available in 'Operation'">class exte extends <error descr="Cannot inherit from enum 'Operation'">Operation</error></error> {
 }