Fix error reporting on member declarations.

lib/compiler/implementation/scanner/parser.dart

Index: lib/compiler/implementation/scanner/parser.dart
diff --git a/lib/compiler/implementation/scanner/parser.dart b/lib/compiler/implementation/scanner/parser.dart
index 48fc94ddc6634a2d756a6e30be6e1c36bcc018c2..d8831568f4ff97186162762bdcac013b3007c3e1 100644
--- a/lib/compiler/implementation/scanner/parser.dart
+++ b/lib/compiler/implementation/scanner/parser.dart
@@ -644,6 +644,7 @@ class Parser {
   }
 
   Link<Token> findMemberName(Token token) {
+    Token start = token;
     Link<Token> identifiers = const EmptyLink<Token>();
     while (token.kind !== EOF_TOKEN) {
       String value = token.stringValue;
@@ -673,7 +674,7 @@ class Parser {
       }
       token = token.next;
     }
-    return listener.unexpected(token);
+    return listener.expectedDeclaration(start);
   }
 
   Token parseVariableInitializerOpt(Token token) {