java: track java usages of annotation methods in Unused Declaration inspection (IDEA-256632)

psi hack because UAST lacks annotation property references

GitOrigin-RevId: 9d5f2fd8e9d55584be60ca529512dd0714fb551d

java/java-analysis-impl/src/com/intellij/codeInspection/reference/RefJavaUtilImpl.java

@@ -51,6 +51,23 @@ public final class RefJavaUtilImpl extends RefJavaUtil {
                          return false;
                        }
 
+                       @Override
+                       public boolean visitNamedExpression(@NotNull UNamedExpression node) {
+                         PsiElement source = node.getSourcePsi();
+                         if (source instanceof PsiNameValuePair pair) {
+                           PsiReference reference = pair.getReference();
+                           if (reference != null) {
+                             PsiElement target = reference.resolve();
+                             final RefElement refElement = refManager.getReference(target);
+                             if (refElement != null) {
+                               refElement.initializeIfNeeded();
+                               refFrom.addReference(refElement, target, decl, false, true, node);
+                             }
+                           }
+                         }
+                         return false;
+                       }
+
                        @Override
                        public boolean visitAnnotation(@NotNull UAnnotation node) {
                          PsiClass javaClass = node.resolve();

java/java-tests/testData/inspection/deadCode/annotation/expected.xml

@@ -25,5 +25,10 @@
     <line>25</line>
     <description>Interface is not implemented.</description>
   </problem>
+  <problem>
+    <file>RepeatableAnnotation.java</file>
+    <line>41</line>
+    <description>Method is never used.</description>
+  </problem>
 </problems>
 

java/java-tests/testData/inspection/deadCode/annotation/src/RepeatableAnnotation.java

@@ -36,5 +36,13 @@ class Annotated1 {
   public static void main(String[] args) {
   }
 }
-
+@interface TestAnn {
+  String str();
+  int digit() default 2;
+}
+class Test {
+  @TestAnn(str = "test")
+  public static void main(String[] args) {
+  }
+}