From 3c384cf9a8ed4230cf87f14ab017b613b38df628 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sun, 6 Dec 2020 10:30:50 +0000
Subject: fix corner case in `collapse_vars` (#4332)

fixes #4331
---
 test/compress/spread.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'test/compress')

diff --git a/test/compress/spread.js b/test/compress/spread.js
index 01818dc3..21ccbe6d 100644
--- a/test/compress/spread.js
+++ b/test/compress/spread.js
@@ -399,3 +399,29 @@ issue_4329: {
     expect_stdout: "PASS"
     node_version: ">=8"
 }
+
+issue_4331: {
+    options = {
+        collapse_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var a = "PASS", b;
+        console,
+        b = a;
+        (function() {
+            a++;
+        })(...a);
+        console.log(b);
+    }
+    expect: {
+        var a = "PASS", b;
+        console;
+        (function() {
+            a++;
+        })(...b = a);
+        console.log(b);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=8"
+}
-- 
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