From 85071b61a3955461e1493d13c1e0c5f3f78e7c01 Mon Sep 17 00:00:00 2001
From: Daniil Gentili <daniil@daniil.it>
Date: Thu, 24 Nov 2022 11:28:00 +0100
Subject: [PATCH] Fix #8748

---
 .../Expression/Call/Method/MethodCallPurityAnalyzer.php         | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/Call/Method/MethodCallPurityAnalyzer.php b/src/Psalm/Internal/Analyzer/Statements/Expression/Call/Method/MethodCallPurityAnalyzer.php
index 1b5859bd660..0fde9d86617 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/Call/Method/MethodCallPurityAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/Call/Method/MethodCallPurityAnalyzer.php
@@ -158,7 +158,7 @@ public static function analyze(
                     && !isset($class_storage->declaring_property_ids[$name]);
 
                 if ($this_property_didnt_exist) {
-                    $context->vars_in_scope[$mutation_var_id] = Type::getMixed();
+                    unset($context->vars_in_scope[$mutation_var_id]);
                 } else {
                     $new_type = AssignmentAnalyzer::getExpandedPropertyType(
                         $codebase,