From 76f40e25285e017d95780dac61e1f8fef395e8c2 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Tue, 12 May 2020 15:28:55 +0100
Subject: fix corner case in `collapse_vars` (#3892)

fixes #3891
---
 test/compress/collapse_vars.js | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

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

diff --git a/test/compress/collapse_vars.js b/test/compress/collapse_vars.js
index ff0837a2..dee370cf 100644
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -7979,3 +7979,39 @@ issue_3884: {
     }
     expect_stdout: "101 32"
 }
+
+issue_3891: {
+    options = {
+        collapse_vars: true,
+        passes: 2,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function log(a) {
+            console.log(typeof a);
+        }
+        log(function f() {
+            try {
+                do {
+                    var b = function() {}();
+                } while (f = 0, b.p);
+            } catch (e) {
+                var f;
+                b;
+            }
+        });
+    }
+    expect: {
+        function log(a) {
+            console.log(typeof a);
+        }
+        log(function() {
+            try {
+                do {} while ((void 0).p);
+            } catch (e) {}
+        });
+    }
+    expect_stdout: "function"
+}
-- 
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