From b371dc2d1ed523e9a8b38ef4eb5826fa0fdfcf05 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sat, 23 Jul 2022 00:18:26 +0100
Subject: [PATCH] fix corner case in `collapse_vars` (#5574)

fixes #5573
---
 lib/compress.js               |  3 ++-
 test/compress/destructured.js | 27 +++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/lib/compress.js b/lib/compress.js
index a1e6497a..7819414b 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2593,7 +2593,8 @@ Compressor.prototype.compress = function(node) {
                         if (value instanceof AST_Array) return !all(node.elements, function(element, index) {
                             return !arg_may_throw(reject, element, value[index]);
                         });
-                        return value.is_string(compressor) && !all(node.elements, function(element) {
+                        if (!value.is_string(compressor)) return true;
+                        return !all(node.elements, function(element) {
                             return !arg_may_throw(reject, element);
                         });
                     }
diff --git a/test/compress/destructured.js b/test/compress/destructured.js
index 4cef240b..81640318 100644
--- a/test/compress/destructured.js
+++ b/test/compress/destructured.js
@@ -3817,3 +3817,30 @@ issue_5533_drop_fargs: {
     expect_stdout: "PASS"
     node_version: ">=6"
 }
+
+issue_5573: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var log = console.log;
+        var a = "FAIL";
+        (function([ { [log(a)]: b } ]) {
+            A = 42;
+        })((a = "PASS", [ {} ]));
+        log(a, A);
+    }
+    expect: {
+        var log = console.log;
+        var a = "FAIL";
+        (function([ { [log(a)]: b } ]) {
+            A = 42;
+        })((a = "PASS", [ {} ]));
+        log(a, A);
+    }
+    expect_stdout: [
+        "PASS",
+        "PASS 42",
+    ]
+    node_version: ">=6"
+}