Mention the annotation name in UnnecessaryQualifier

PiperOrigin-RevId: 878979262

Author: cushon

core/src/main/java/com/google/errorprone/bugpatterns/UnnecessaryQualifier.java

@@ -32,6 +32,7 @@
 import static com.google.errorprone.util.ASTHelpers.hasExplicitSource;
 import static com.google.errorprone.util.ASTHelpers.isRecord;
 import static com.google.errorprone.util.ASTHelpers.isSubtype;
+import static java.util.stream.Collectors.joining;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
@@ -176,9 +177,18 @@ private Description deleteAnnotations(
     if (explicitAnnotations.isEmpty()) {
       return NO_MATCH;
     }
-    return describeMatch(
-        explicitAnnotations.getFirst(),
-        explicitAnnotations.stream().map(SuggestedFix::delete).collect(mergeFixes()));
+    boolean plural = explicitAnnotations.size() > 1;
+    return buildDescription(explicitAnnotations.getFirst())
+        .addFix(explicitAnnotations.stream().map(SuggestedFix::delete).collect(mergeFixes()))
+        .setMessage(
+            String.format(
+                "Qualifier annotation%s %s %s no effect here",
+                plural ? "s" : "",
+                explicitAnnotations.stream()
+                    .map(anno -> getSymbol(anno).getQualifiedName().toString())
+                    .collect(joining(", ", "@", "")),
+                plural ? "have" : "has"))
+        .build();
   }
 
   private static ImmutableList<AnnotationTree> getQualifiers(

core/src/test/java/com/google/errorprone/bugpatterns/UnnecessaryQualifierTest.java

@@ -57,7 +57,7 @@ public void unannotatedField() {
             "Test.java",
             """
             class Test {
-              // BUG: Diagnostic contains:
+              // BUG: Diagnostic contains: Qualifier annotation @Qual has no effect here
               @Qual int x;
             }
             """)