added template line number to sandbox security check calls

src/Node/CheckToStringNode.php

@@ -33,9 +33,12 @@ class CheckToStringNode extends AbstractExpression
 
     public function compile(Compiler $compiler)
     {
+        $expr = $this->getNode('expr');
         $compiler
             ->raw('$this->sandbox->ensureToStringAllowed(')
-            ->subcompile($this->getNode('expr'))
+            ->subcompile($expr)
+            ->raw(', ')
+            ->repr($expr->getTemplateLine())
             ->raw(', $this->source)')
         ;
     }