From 78a44d5ab0fd2195c8f22cc8a39193b33dad6188 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sun, 4 Feb 2018 03:58:49 +0800
Subject: maintain order between side-effects and externally observable
 assignments (#2879)

fixes #2878
---
 test/compress/collapse_vars.js | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'test/compress')

diff --git a/test/compress/collapse_vars.js b/test/compress/collapse_vars.js
index ad09edc3..4191de85 100644
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -4433,3 +4433,37 @@ issue_2873_2: {
     }
     expect_stdout: "0 1"
 }
+
+issue_2878: {
+    options = {
+        collapse_vars: true,
+        sequences: true,
+    }
+    input: {
+        var c = 0;
+        (function (a, b) {
+            function f2() {
+                if (a) c++;
+            }
+            b = f2();
+            a = 1;
+            b && b.b;
+            f2();
+        })();
+        console.log(c);
+    }
+    expect: {
+        var c = 0;
+        (function (a, b) {
+            function f2() {
+                if (a) c++;
+            }
+            b = f2(),
+            a = 1,
+            b && b.b,
+            f2();
+        })(),
+        console.log(c);
+    }
+    expect_stdout: "1"
+}
-- 
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