From cf120c7cea2721626caa67767d720431becf7f62 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sat, 21 Nov 2020 00:57:59 +0000
Subject: fix corner case in `merge_vars` & `reduce_vars` (#4313)

fixes #4312
---
 test/compress/destructured.js | 31 +++++++++++++++++++++++++++++++
 test/compress/functions.js    |  5 +++--
 2 files changed, 34 insertions(+), 2 deletions(-)

(limited to 'test')

diff --git a/test/compress/destructured.js b/test/compress/destructured.js
index f8e8090d..e654847a 100644
--- a/test/compress/destructured.js
+++ b/test/compress/destructured.js
@@ -1616,3 +1616,34 @@ issue_4308: {
     expect_stdout: "PASS"
     node_version: ">=6"
 }
+
+issue_4312: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        merge_vars: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a;
+        (function f(b, c) {
+            return function({
+                [a = b]: d,
+            }) {}(c && c);
+        })("PASS", "FAIL");
+        console.log(a);
+    }
+    expect: {
+        var a;
+        b = "PASS",
+        (function({
+            [a = b]: d,
+        }){})((c = "FAIL") && c);
+        var b, c;
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
diff --git a/test/compress/functions.js b/test/compress/functions.js
index 686e7a50..e06596b8 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -521,7 +521,7 @@ issue_2531_2: {
     options = {
         evaluate: true,
         inline: true,
-        passes: 3,
+        passes: 2,
         reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
@@ -556,9 +556,10 @@ issue_2531_3: {
     options = {
         evaluate: true,
         inline: true,
-        passes: 3,
+        passes: 2,
         reduce_funcs: true,
         reduce_vars: true,
+        sequences: true,
         side_effects: true,
         toplevel: true,
         unused: true,
-- 
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