From 18dbceb36f02db6100c1588a77c18c6ca73f1baa Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Fri, 15 Jan 2021 04:33:17 +0000
Subject: fix corner case in `unused` (#4557)

fixes #4556
---
 test/compress/spreads.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'test')

diff --git a/test/compress/spreads.js b/test/compress/spreads.js
index 1e4dcbf6..7c98fdcd 100644
--- a/test/compress/spreads.js
+++ b/test/compress/spreads.js
@@ -826,3 +826,23 @@ issue_4363: {
     expect_stdout: "PASS"
     node_version: ">=8"
 }
+
+issue_4556: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            var a = "" + [ a++ ];
+            var b = [ ...a ];
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var a;
+        }());
+    }
+    expect_stdout: "undefined"
+    node_version: ">=6"
+}
-- 
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