Implement initializer asserts.

pkg/front_end/lib/src/fasta/parser/class_member_parser.dart

Index: pkg/front_end/lib/src/fasta/parser/class_member_parser.dart
diff --git a/pkg/front_end/lib/src/fasta/parser/class_member_parser.dart b/pkg/front_end/lib/src/fasta/parser/class_member_parser.dart
index 1ab36b1920ecc0315a5b5e97df32ffd96c9894d1..5de363edd91d007f7d7aedba4a1a7c2dcfeb94d1 100644
--- a/pkg/front_end/lib/src/fasta/parser/class_member_parser.dart
+++ b/pkg/front_end/lib/src/fasta/parser/class_member_parser.dart
@@ -6,21 +6,33 @@ library fasta.parser.class_member_parser;
 
 import '../../scanner/token.dart' show Token;
 
+import '../fasta_codes.dart' show FastaMessage;
+
 import 'listener.dart' show Listener;
 
-import 'parser.dart' show Parser;
+import 'parser.dart' show Assert, Parser;
 
 /// Parser similar to [TopLevelParser] but also parses class members (excluding
 /// their bodies).
 class ClassMemberParser extends Parser {
   ClassMemberParser(Listener listener) : super(listener);
 
+  @override
   Token parseExpression(Token token) => skipExpression(token);
 
-  Token parseRecoverExpression(Token token) {
+  @override
+  Token parseAssert(Token token, Assert kind) {
+    if (kind == Assert.Statement) {
+      return super.parseAssert(token, kind);
+    } else {
+      return skipExpression(token);
+    }
+  }
+
+  Token parseRecoverExpression(Token token, FastaMessage message) {
     Token begin = token;
     token = skipExpression(token);
-    listener.handleRecoverExpression(begin);
+    listener.handleRecoverExpression(begin, message);
     return token;
   }