From af9e8a1e92e2f036b4115211908b4d1b6ad1c323 Mon Sep 17 00:00:00 2001
From: Martin Probst <martin.probst@medx.net>
Date: Wed, 21 Oct 2015 10:50:05 +0200
Subject: [PATCH] fix #1023: getExpectedTokens() returns out of context tokens
 on consecutive runs

---
 runtime/JavaScript/src/antlr4/error/ErrorStrategy.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/runtime/JavaScript/src/antlr4/error/ErrorStrategy.js b/runtime/JavaScript/src/antlr4/error/ErrorStrategy.js
index f1e852616..f2993e713 100644
--- a/runtime/JavaScript/src/antlr4/error/ErrorStrategy.js
+++ b/runtime/JavaScript/src/antlr4/error/ErrorStrategy.js
@@ -269,7 +269,8 @@ DefaultErrorStrategy.prototype.sync = function(recognizer) {
     case ATNState.PLUS_LOOP_BACK:
     case ATNState.STAR_LOOP_BACK:
         this.reportUnwantedToken(recognizer);
-        var expecting = recognizer.getExpectedTokens();
+        var expecting = new IntervalSet();
+        expecting.addSet(recognizer.getExpectedTokens());
         var whatFollowsLoopIterationOrRule = expecting.addSet(this.getErrorRecoverySet(recognizer));
         this.consumeUntil(recognizer, whatFollowsLoopIterationOrRule);
         break;