Verify that required param constants are accessible outside the declaring lib (#26440).

pkg/analyzer/lib/src/generated/error.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.generated.error;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart' show AstNode;
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 3577 matching lines @@
 
   /**
    * Generate a hint for a constructor, function or method invocation where a
    * required parameter is missing.
    *
    * Parameters:
    * 0: the name of the parameter
    * 1: message details
    */
   static const HintCode MISSING_REQUIRED_PARAM_WITH_DETAILS = const HintCode(
-      'MISSING_REQUIRED_PARAM', "The parameter '{0}' is required. {1}");
+      'MISSING_REQUIRED_PARAM_WITH_DETAILS',
+      "The parameter '{0}' is required. {1}");
 
   /**
    * Generate a hint for an element that is annotated with `@JS(...)` whose
    * library declaration is not similarly annotated.
    */
   static const HintCode MISSING_JS_LIB_ANNOTATION = const HintCode(
       'MISSING_JS_LIB_ANNOTATION',
       "The @JS() annotation can only be used if it is also declared on the library directive.");
 
   /**
@@ skipping 2200 matching lines @@
    * Initialize a newly created error code to have the given [name].
    */
   const TodoCode(String name) : super(name, "{0}");
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.INFO;
 
   @override
   ErrorType get type => ErrorType.TODO;
 }