From 67278e76c8777d57d40b42151be28b527e692ba2 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Tue, 19 Nov 2019 04:26:41 +0800
Subject: fix corner case in `unused` (#3599)

fixes #3598
---
 test/compress/drop-unused.js | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'test')

diff --git a/test/compress/drop-unused.js b/test/compress/drop-unused.js
index 297fa01a..15420d8a 100644
--- a/test/compress/drop-unused.js
+++ b/test/compress/drop-unused.js
@@ -2235,3 +2235,34 @@ function_assign: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3598: {
+    options = {
+        collapse_vars: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            (function() {
+                var b = void 0;
+                a = "PASS";
+                c.p = 0;
+                var c = b[!1];
+            })();
+        } catch (e) {}
+        console.log(a);
+    }
+    expect: {
+        var a = "FAIL";
+        try {
+            (function() {
+                a = "PASS";
+                var c = (void (c.p = 0))[!1];
+            })();
+        } catch (e) {}
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}
-- 
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