Do not offer to bind a declaring parameter to a field

Closes https://github.com/dart-lang/sdk/issues/63540

Change-Id: I72f8f76878e5a058f58aca80b1543a1141a68b72
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/511100
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Samuel Rawlins <srawlins@google.com>

pkg/analysis_server/lib/src/services/correction/dart/bind_to_field.dart

@@ -44,6 +44,13 @@ class BindToField extends ResolvedCorrectionProducer {
           return;
         }
       }
+      if (parameter.declaredFragment?.element
+          case FieldFormalParameterElement element) {
+        if (element.isDeclaring) {
+          // A declaring parameter is already bound to a field.
+          return;
+        }
+      }
       await tryReplacingParameter(file, builder, parameter, libraryElement2);
     }
   }

pkg/analysis_server/test/src/services/correction/assist/bind_to_field_test.dart

@@ -21,6 +21,13 @@ class BindToFieldTest extends AssistProcessorTest {
   @override
   AssistKind get kind => DartAssistKind.bindToField;
 
+  Future<void> test_class_primaryConstructor_declaring() async {
+    await resolveTestCode('''
+class C(final int ^i);
+''');
+    await assertNoAssist();
+  }
+
   Future<void> test_class_primaryConstructor_requiredPositional() async {
     await resolveTestCode('''
 class C(int ^i);