--- a/langtools/src/share/classes/com/sun/tools/javac/parser/JavacParser.java	Tue Oct 01 17:41:57 2013 -0400
+++ b/langtools/src/share/classes/com/sun/tools/javac/parser/JavacParser.java	Wed Oct 02 17:04:51 2013 +0100
@@ -3002,8 +3002,9 @@
         int pos = token.pos;
         Name name;
         if (lambdaParameter && token.kind == UNDERSCORE) {
-            syntaxError(pos, "expected", IDENTIFIER);
+            log.error(pos, "underscore.as.identifier.in.lambda");
             name = token.name();
+            nextToken();
         } else {
             if (allowThisIdent) {
                 JCExpression pn = qualident(false);