Include the field documentation for named field formal parameter completion suggestions.

pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart

Index: pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart
index 6332eebde90d0a4f6823e7fef53cc16d8cf0bf5c..d534e1dab3f8e806ccd5eb69d4aafe65a12cabee 100644
--- a/pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/arglist_contributor_test.dart
@@ -256,7 +256,8 @@ class A { const A(int one, int two, int three, {int four, String five:
 
   test_ArgumentList_imported_factory_named_param() async {
     // ArgumentList  InstanceCreationExpression  ExpressionStatement
-    addSource('/libA.dart', 'library libA; class A{factory A({int one}) => null;}');
+    addSource(
+        '/libA.dart', 'library libA; class A{factory A({int one}) => null;}');
     addTestSource('import "/libA.dart"; main() { new A(^);}');
     await computeSuggestions();
     assertSuggestArgumentsAndTypes(namedArgumentsWithTypes: {'one': 'int'});
@@ -264,7 +265,8 @@ class A { const A(int one, int two, int three, {int four, String five:
 
   test_ArgumentList_imported_factory_named_param2() async {
     // ArgumentList  InstanceCreationExpression  ExpressionStatement
-    addSource('/libA.dart', 'library libA; abstract class A{factory A.foo({int one});}');
+    addSource('/libA.dart',
+        'library libA; abstract class A{factory A.foo({int one});}');
     addTestSource('import "/libA.dart"; main() { new A.foo(^);}');
     await computeSuggestions();
     assertSuggestArgumentsAndTypes(namedArgumentsWithTypes: {'one': 'int'});
@@ -479,6 +481,40 @@ class A { const A(int one, int two, int three, {int four, String five:
         namedArgumentsWithTypes: {'radix': 'int', 'onError': '(String) → int'});
   }
 
+  test_ArgumentList_local_constructor_named_fieldFormal_documentation() async {
+    addTestSource('''
+class A {
+  /// aaa
+  ///
+  /// bbb
+  /// ccc
+  int fff;
+A({this.fff}) { } }
+main() {
+  new A(^);
+}
+''');
+    await computeSuggestions();
+    expect(suggestions, hasLength(1));
+    expect(suggestions[0].docSummary, 'aaa');
+    expect(suggestions[0].docComplete, 'aaa\n\nbbb\nccc');
+  }
+
+  test_ArgumentList_local_constructor_named_fieldFormal_noDocumentation() async {
+    addTestSource('''
+class A {
+  int fff;
+A({this.fff}) { } }
+main() {
+  new A(^);
+}
+''');
+    await computeSuggestions();
+    expect(suggestions, hasLength(1));
+    expect(suggestions[0].docSummary, isNull);
+    expect(suggestions[0].docComplete, isNull);
+  }
+
   test_ArgumentList_local_constructor_named_param() async {
     //
     addTestSource('''