Issue 25733. Built-in itentifiers are not permitted as prefixes.

pkg/analyzer/lib/src/error/codes.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.error.codes;
 
 import 'package:analyzer/error/error.dart';
 
 export 'package:analyzer/src/analysis_options/error/option_codes.dart';
 export 'package:analyzer/src/dart/error/hint_codes.dart';
@@ skipping 231 matching lines @@
    * immediately enclosing _a_ is not declared asynchronous. (Where _a_ is the
    * await expression.)
    */
   static const CompileTimeErrorCode AWAIT_IN_WRONG_CONTEXT =
       const CompileTimeErrorCode(
           'AWAIT_IN_WRONG_CONTEXT',
           "The await expression can only be used in an asynchronous function.",
           "Try marking the function body with either 'async' or 'async*'.");
 
   /**
+   * 16.33 Identifier Reference: It is a compile-time error if a built-in
+   * identifier is used as the declared name of a prefix, class, type parameter
+   * or type alias.
+   *
+   * Parameters:
+   * 0: the built-in identifier that is being used
+   */
+  static const CompileTimeErrorCode BUILT_IN_IDENTIFIER_AS_PREFIX_NAME =
+      const CompileTimeErrorCode(
+          'BUILT_IN_IDENTIFIER_AS_PREFIX_NAME',
+          "The built-in identifier '{0}' can't be used as a prefix name.",
+          "Try choosing a different name for the prefix.");
+
+  /**
    * 12.30 Identifier Reference: It is a compile-time error to use a built-in
    * identifier other than dynamic as a type annotation.
    *
    * Parameters:
    * 0: the built-in identifier that is being used
    */
   static const CompileTimeErrorCode BUILT_IN_IDENTIFIER_AS_TYPE =
       const CompileTimeErrorCode(
           'BUILT_IN_IDENTIFIER_AS_TYPE',
           "The built-in identifier '{0}' can't be used as a type.",
           "Try correcting the name to match an existing type.");
 
   /**
-   * 12.30 Identifier Reference: It is a compile-time error if a built-in
-   * identifier is used as the declared name of a class, type parameter or type
-   * alias.
+   * 16.33 Identifier Reference: It is a compile-time error if a built-in
+   * identifier is used as the declared name of a prefix, class, type parameter
+   * or type alias.
    *
    * Parameters:
    * 0: the built-in identifier that is being used
    */
   static const CompileTimeErrorCode BUILT_IN_IDENTIFIER_AS_TYPE_NAME =
       const CompileTimeErrorCode(
           'BUILT_IN_IDENTIFIER_AS_TYPE_NAME',
           "The built-in identifier '{0}' can't be used as a type name.",
           "Try choosing a different name for the type.");
 
   /**
-   * 12.30 Identifier Reference: It is a compile-time error if a built-in
-   * identifier is used as the declared name of a class, type parameter or type
-   * alias.
+   * 16.33 Identifier Reference: It is a compile-time error if a built-in
+   * identifier is used as the declared name of a prefix, class, type parameter
+   * or type alias.
    *
    * Parameters:
    * 0: the built-in identifier that is being used
    */
   static const CompileTimeErrorCode BUILT_IN_IDENTIFIER_AS_TYPEDEF_NAME =
       const CompileTimeErrorCode(
           'BUILT_IN_IDENTIFIER_AS_TYPEDEF_NAME',
           "The built-in identifier '{0}' can't be used as a typedef name.",
           "Try choosing a different name for the typedef.");
 
   /**
-   * 12.30 Identifier Reference: It is a compile-time error if a built-in
-   * identifier is used as the declared name of a class, type parameter or type
-   * alias.
+   * 16.33 Identifier Reference: It is a compile-time error if a built-in
+   * identifier is used as the declared name of a prefix, class, type parameter
+   * or type alias.
    *
    * Parameters:
    * 0: the built-in identifier that is being used
    */
   static const CompileTimeErrorCode BUILT_IN_IDENTIFIER_AS_TYPE_PARAMETER_NAME =
       const CompileTimeErrorCode(
           'BUILT_IN_IDENTIFIER_AS_TYPE_PARAMETER_NAME',
           "The built-in identifier '{0}' can't be used as a type parameter name.",
           "Try choosing a different name for the type parameter.");
 
@@ skipping 4637 matching lines @@
    * created from the optional [correction] template.
    */
   const StrongModeCode(ErrorType type, String name, String message,
       [String correction])
       : type = type,
         super('STRONG_MODE_$name', message, correction);
 
   @override
   ErrorSeverity get errorSeverity => type.severity;
 }