From 938368ba219f29703b9f9e67c6fb0d1c0723220a Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Thu, 14 May 2020 00:52:42 +0100
Subject: enhance `collapse_vars` (#3896)

---
 test/compress/collapse_vars.js | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

(limited to 'test/compress/collapse_vars.js')

diff --git a/test/compress/collapse_vars.js b/test/compress/collapse_vars.js
index dee370cf..0dd8754d 100644
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -8015,3 +8015,38 @@ issue_3891: {
     }
     expect_stdout: "function"
 }
+
+issue_3894: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function log(msg) {
+            console.log(msg ? "FAIL" : "PASS");
+        }
+        var a, c;
+        (function(b) {
+            a = c = 0,
+            log(b);
+        })(-0);
+        log(a);
+        log(c);
+    }
+    expect: {
+        function log(msg) {
+            console.log(msg ? "FAIL" : "PASS");
+        }
+        var a, c;
+        void log(-(a = c = 0));
+        log(a);
+        log(c);
+    }
+    expect_stdout: [
+        "PASS",
+        "PASS",
+        "PASS",
+    ]
+}
-- 
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