From 5e6307974fa2b1e7972ab8c58b636eaed47a54fb Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Wed, 10 Feb 2021 00:45:36 +0000
Subject: fix corner case in `collapse_vars` (#4634)

fixes #4633
---
 lib/compress.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/compress.js')

diff --git a/lib/compress.js b/lib/compress.js
index c822a8e7..3fcfe2d2 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2009,7 +2009,7 @@ merge(Compressor.prototype, {
                     };
                     var tw = new TreeWalker(function(node) {
                         if (!arg) return true;
-                        if (has_await(node)) {
+                        if (has_await(node) || node instanceof AST_Yield) {
                             arg = null;
                             return true;
                         }
-- 
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