fix corner case in `loops` & `unused` (#4356)

fixes #4355

1 files changed, 29 insertions, 0 deletions

diff --git a/test/compress/destructured.js b/test/compress/destructured.js
index eb6834a4..82d02172 100644
--- a/test/compress/destructured.js
+++ b/test/compress/destructured.js
@@ -1777,3 +1777,32 @@ issue_4323: {
     expect_stdout: "function"
     node_version: ">=6"
 }
+
+issue_4355: {
+    options = {
+        loops: true,
+        unused: true,
+    }
+    input: {
+        var a;
+        (function({
+            [function() {
+                for (a in "foo");
+            }()]: b,
+        }) {
+            var a;
+        })(0);
+        console.log(a);
+    }
+    expect: {
+        var a;
+        (function({
+            [function() {
+                for (a in "foo");
+            }()]: b,
+        }) {})(0);
+        console.log(a);
+    }
+    expect_stdout: "2"
+    node_version: ">=6"
+}