Analysis.getHover should return the field's documentation for field formal parameters.

pkg/analysis_server/test/analysis/get_hover_test.dart

Index: pkg/analysis_server/test/analysis/get_hover_test.dart
diff --git a/pkg/analysis_server/test/analysis/get_hover_test.dart b/pkg/analysis_server/test/analysis/get_hover_test.dart
index 7f48ae2d97683c34745be9e39479de621943e540..66db6aaed1f9c3332cb9a97641de86fdbb393998 100644
--- a/pkg/analysis_server/test/analysis/get_hover_test.dart
+++ b/pkg/analysis_server/test/analysis/get_hover_test.dart
@@ -308,6 +308,48 @@ class A {
     expect(hover.parameter, isNull);
   }
 
+  test_expression_parameter_fieldFormal_declaration() async {
+    addTestFile('''
+class A {
+  /// The field documentation.
+  final int fff;
+  A({this.fff});
+}
+main() {
+  new A(fff: 42);
+}
+''');
+    HoverInformation hover = await prepareHover('fff});');
+    expect(hover.containingLibraryName, isNull);
+    expect(hover.containingLibraryPath, isNull);
+    expect(hover.containingClassDescription, isNull);
+    expect(hover.dartdoc, 'The field documentation.');
+    expect(hover.elementDescription, '{int fff}');
+    expect(hover.elementKind, 'parameter');
+    expect(hover.staticType, 'int');
+  }
+
+  test_expression_parameter_fieldFormal_use() async {
+    addTestFile('''
+class A {
+  /// The field documentation.
+  final int fff;
+  A({this.fff});
+}
+main() {
+  new A(fff: 42);
+}
+''');
+    HoverInformation hover = await prepareHover('fff: 42');
+    expect(hover.containingLibraryName, isNull);
+    expect(hover.containingLibraryPath, isNull);
+    expect(hover.containingClassDescription, isNull);
+    expect(hover.dartdoc, 'The field documentation.');
+    expect(hover.elementDescription, '{int fff}');
+    expect(hover.elementKind, 'parameter');
+    expect(hover.staticType, 'int');
+  }
+
   test_expression_syntheticGetter_invocation() async {
     addTestFile('''
 library my.library;