From 9f8106e1d845f66033c3c73e2e3844cf32fd4bb2 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Wed, 14 Oct 2020 00:18:26 +0100
Subject: fix corner case in `collapse_vars` (#4217)

fixes #4216
---
 test/compress/const.js | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'test')

diff --git a/test/compress/const.js b/test/compress/const.js
index 4411cbf8..27c55ddb 100644
--- a/test/compress/const.js
+++ b/test/compress/const.js
@@ -1009,3 +1009,26 @@ issue_4212_2: {
     }
     expect_stdout: true
 }
+
+issue_4216: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        dead_code: true,
+        evaluate: true,
+    }
+    input: {
+        if (a = 0) {
+            const a = 0;
+        }
+        console.log(typeof a);
+    }
+    expect: {
+        a = 0;
+        {
+            const a = void 0;
+        }
+        console.log(typeof a);
+    }
+    expect_stdout: true
+}
-- 
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