Extract ExpressionParserText from SimpleParserTest.

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/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/generated/parser.dart' as analyzer;
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:front_end/src/fasta/analyzer/ast_builder.dart';
@@ skipping 613 matching lines @@
   @override
   set enableGenericMethodComments(bool value) {
     if (value == true) {
       // TODO(paulberry,ahe): generic method comment syntax is not supported by
       // Fasta.
       throw new UnimplementedError();
     }
   }
 
   @override
+  set enableLazyAssignmentOperators(bool value) {
+    // TODO: implement enableLazyAssignmentOperators
+    if (value == true) {
+      throw new UnimplementedError();
+    }
+  }
+
+  @override
   set enableNnbd(bool value) {
     if (value == true) {
       // TODO(paulberry,ahe): non-null-by-default syntax is not supported by
       // Fasta.
       throw new UnimplementedError();
     }
   }
 
   @override
   set enableUriInPartOf(bool value) {
@@ skipping 678 matching lines @@
   void test_parseTypeAlias_genericFunction_typeParameters_voidReturnType() {
     super.test_parseTypeAlias_genericFunction_typeParameters_voidReturnType();
   }
 
   @override
   @failingTest
   void test_parseTypeAlias_genericFunction_voidReturnType() {
     super.test_parseTypeAlias_genericFunction_voidReturnType();
   }
 }