Prepare for development branch by updating externally-used API.

pkg/analyzer/test/generated/parser_fasta_test.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart' as analyzer;
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/fasta/ast_builder.dart';
 import 'package:analyzer/src/fasta/element_store.dart';
@@ skipping 812 matching lines @@
 /**
  * Proxy implementation of [Scope] used by Fasta parser tests.
  *
  * Any name lookup request is satisfied by creating an instance of
  * [BuilderProxy].
  */
 class ScopeProxy implements Scope {
   final _locals = <String, Builder>{};
 
   @override
-  void operator []=(String name, Builder member) {
-    _locals[name] = member;
+  declare(String name, Builder builder, int charOffset, Uri fileUri) {
+    _locals[name] = builder;
+    return null;
   }
 
   @override
   Scope createNestedScope({bool isModifiable: true}) {
     return new Scope.nested(this, isModifiable: isModifiable);
   }
 
   @override
   Builder lookup(String name, int charOffset, Uri fileUri,
           {bool isInstanceScope: true}) =>
@@ skipping 108 matching lines @@
   }
 
   @override
   @failingTest
   void test_parsePartOfDirective_uri() {
     // TODO(paulberry,ahe): URIs in "part of" declarations are not supported by
     // Fasta.
     super.test_parsePartOfDirective_uri();
   }
 }