From 04583fe0c6eb4513075f9f2dd18fedcd6ee00d84 Mon Sep 17 00:00:00 2001
From: Matthew Honnibal <honnibal+gh@gmail.com>
Date: Thu, 25 Jun 2020 21:19:33 +0200
Subject: [PATCH] Copy examples at the start of Language.update

---
 spacy/language.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/spacy/language.py b/spacy/language.py
index c3ce6f233..573b83e5f 100644
--- a/spacy/language.py
+++ b/spacy/language.py
@@ -535,7 +535,7 @@ class Language(object):
             examples = [examples]
         for eg in examples:
             if isinstance(eg, Example):
-                converted_examples.append(eg)
+                converted_examples.append(eg.copy())
             elif isinstance(eg, tuple):
                 doc, annot = eg
                 if isinstance(doc, str):