From cc764299e01b3368077d87ff19591f08bc095d19 Mon Sep 17 00:00:00 2001
From: alexlamsl <alexlamsl@gmail.com>
Date: Sun, 29 Sep 2024 00:14:58 +0300
Subject: [PATCH] fix corner case in `dead_code`

fixes #5941
---
 lib/compress.js            |  4 ++--
 test/compress/dead-code.js | 17 +++++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/lib/compress.js b/lib/compress.js
index 831050c9ef..e33a297c54 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -13141,8 +13141,8 @@ Compressor.prototype.compress = function(node) {
                 var scope = def.scope.resolve();
                 var local = scope === compressor.find_parent(AST_Lambda);
                 var level = 0, node;
-                parent = compressor.self();
-                if (!(scope.uses_arguments && is_funarg(def)) || compressor.has_directive("use strict")) do {
+                if ((compressor.has_directive("use strict") || !(scope.uses_arguments && is_funarg(def)))
+                    && (parent = compressor.self()) === self) do {
                     node = parent;
                     parent = compressor.parent(level++);
                     if (parent instanceof AST_Assign) {
diff --git a/test/compress/dead-code.js b/test/compress/dead-code.js
index 3a49eb0c11..2868013c83 100644
--- a/test/compress/dead-code.js
+++ b/test/compress/dead-code.js
@@ -1776,3 +1776,20 @@ issue_5882_3: {
     }
     expect_stdout: "true"
 }
+
+issue_5941: {
+    options = {
+        assignments: true,
+        conditionals: true,
+        dead_code: true,
+    }
+    input: {
+        var a = 1;
+        a = a &&= (a = console) && console.log(typeof a);
+    }
+    expect: {
+        var a = 1;
+        a = (a = a && console) && console.log(typeof a);
+    }
+    expect_stdout: "object"
+}