From 55048ab90774e0bb7f98346f39942e5bd2a95128 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Fri, 16 Nov 2018 13:31:29 +0100
Subject: [PATCH] [poincare] VariableContext::expressionForSymbol returns a
 clone of its kept value to unable any modification of its value (without
 calling setExpressionForSymbol).

All contexts::expressionForSymbol return new Expression that can be tempered with.
---
 poincare/src/variable_context.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/poincare/src/variable_context.cpp b/poincare/src/variable_context.cpp
index 448fead7b..858f18c58 100644
--- a/poincare/src/variable_context.cpp
+++ b/poincare/src/variable_context.cpp
@@ -31,7 +31,7 @@ void VariableContext::setExpressionForSymbol(const Expression & expression, cons
 
 const Expression VariableContext::expressionForSymbol(const SymbolAbstract & symbol) {
   if (strcmp(symbol.name(), m_name) == 0) {
-    return m_value;
+    return m_value.clone();
   } else {
     return m_parentContext->expressionForSymbol(symbol);
   }