From f886b3fb2bad77ca7158057b48add16050ceca2a Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Fri, 28 Aug 2020 19:42:17 +0100
Subject: fix corner case in `loops` & `unused` (#4083)

fixes #4082
---
 lib/compress.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/compress.js b/lib/compress.js
index 90dd0f27..bab390cf 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4800,7 +4800,7 @@ merge(Compressor.prototype, {
                 return true;
             }
             if (node instanceof AST_ForIn) {
-                if (!compressor.option("loops")) return;
+                if (!drop_vars || !compressor.option("loops")) return;
                 if (!is_empty(node.body)) return;
                 if (node.init.has_side_effects(compressor)) return;
                 node.object.walk(tw);
-- 
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