From a3bc940cd77e4b68d3a807914df5af807ecb2790 Mon Sep 17 00:00:00 2001
From: Thomas <thomas.burg@gmail.com>
Date: Sun, 7 Jul 2024 17:33:40 +0200
Subject: [PATCH] Fix https://github.com/antlr/antlr4/issues/4656 Remove
 duplicated element to math python3 runtime

---
 runtime/Cpp/runtime/src/tree/xpath/XPath.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/runtime/Cpp/runtime/src/tree/xpath/XPath.cpp b/runtime/Cpp/runtime/src/tree/xpath/XPath.cpp
index c0398962ec..1c4907199b 100755
--- a/runtime/Cpp/runtime/src/tree/xpath/XPath.cpp
+++ b/runtime/Cpp/runtime/src/tree/xpath/XPath.cpp
@@ -147,7 +147,13 @@ std::vector<ParseTree *> XPath::evaluate(ParseTree *t) {
       }
     }
     i++;
-    work = next;
+    // remove duplicated element
+    work.clear();
+    for (unsigned int i=0; i < next.size(); i++ ){
+        if (std::find(work.begin(),work.end(),next[i]) == std::end(work)) {
+          work.push_back(next[i]);
+	}
+    }
   }
 
   return work;