From fdc10086dafa3b1fbbb686f333b0b7b8e3bb70e5 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Fri, 3 Jan 2020 19:28:47 +0800
Subject: fix corner case in `reduce_vars` (#3667)

fixes #3666
---
 test/compress/reduce_vars.js | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'test')

diff --git a/test/compress/reduce_vars.js b/test/compress/reduce_vars.js
index 5984042f..3331732a 100644
--- a/test/compress/reduce_vars.js
+++ b/test/compress/reduce_vars.js
@@ -6847,3 +6847,34 @@ issue_3631_2: {
     }
     expect_stdout: "undefined"
 }
+
+issue_3666: {
+    options = {
+        collapse_vars: true,
+        passes: 2,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        try {
+            var a = "FAIL";
+        } finally {
+            for (;!a;)
+                var c = a++;
+            var a = "PASS", b = c = "PASS";
+        }
+        console.log(a, b);
+    }
+    expect: {
+        try {
+            var a = "FAIL";
+        } finally {
+            for (;!a;)
+                a++;
+            var b = a = "PASS";
+        }
+        console.log(a, b);
+    }
+    expect_stdout: "PASS PASS"
+}
-- 
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