Create new error message for missing generated files

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 2355 matching lines @@
    *
    * 14.1 Imports: It is a compile-time error if the compilation unit found at
    * the specified URI is not a library declaration.
    *
    * 14.3 Parts: It is a compile time error if the contents of the URI are not a
    * valid part declaration.
    *
    * Parameters:
    * 0: the URI pointing to a non-existent file
    *
-   * See [INVALID_URI].
+   * See [INVALID_URI], [URI_HAS_NOT_BEEN_GENERATED].
    */
   static const CompileTimeErrorCode URI_DOES_NOT_EXIST =
       const CompileTimeErrorCode(
           'URI_DOES_NOT_EXIST', "Target of URI does not exist: '{0}'");
 
   /**
+   * Just like [URI_DOES_NOT_EXIST], but used when the URI refers to a file that
+   * is expected to be generated.
+   *
+   * Parameters:
+   * 0: the URI pointing to a non-existent file
+   *
+   * See [INVALID_URI], [URI_DOES_NOT_EXIST].
+   */
+  static const CompileTimeErrorCode URI_HAS_NOT_BEEN_GENERATED =
+      const CompileTimeErrorCode('URI_HAS_NOT_BEEN_GENERATED',
+          "Target of URI has not been generated: '{0}'");
+
+  /**
    * 14.1 Imports: It is a compile-time error if <i>x</i> is not a compile-time
    * constant, or if <i>x</i> involves string interpolation.
    *
    * 14.3 Parts: It is a compile-time error if <i>s</i> is not a compile-time
    * constant, or if <i>s</i> involves string interpolation.
    *
    * 14.5 URIs: It is a compile-time error if the string literal <i>x</i> that
    * describes a URI is not a compile-time constant, or if <i>x</i> involves
    * string interpolation.
    */
@@ skipping 1886 matching lines @@
    * 0: the lexeme of the logical operator
    */
   static const StaticTypeWarningCode NON_BOOL_OPERAND =
       const StaticTypeWarningCode('NON_BOOL_OPERAND',
           "The operands of the '{0}' operator must be assignable to 'bool'");
 
   /**
    *
    */
   static const StaticTypeWarningCode NON_NULLABLE_FIELD_NOT_INITIALIZED =
-      const StaticTypeWarningCode(
-          'NON_NULLABLE_FIELD_NOT_INITIALIZED',
+      const StaticTypeWarningCode('NON_NULLABLE_FIELD_NOT_INITIALIZED',
           "Variable '{0}' of non-nullable type '{1}' must be initialized");
 
   /**
    * 15.8 Parameterized Types: It is a static type warning if <i>A<sub>i</sub>,
    * 1 &lt;= i &lt;= n</i> does not denote a type in the enclosing lexical scope.
    */
   static const StaticTypeWarningCode NON_TYPE_AS_TYPE_ARGUMENT =
       const StaticTypeWarningCode('NON_TYPE_AS_TYPE_ARGUMENT',
           "The name '{0}' is not a type and cannot be used as a parameterized type");
 
@@ skipping 1822 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;
 }