From c748d51856a28e87a0e74fbb08ec0af2d2b02f84 Mon Sep 17 00:00:00 2001
From: alexlamsl <alexlamsl@gmail.com>
Date: Sun, 22 Oct 2017 02:51:29 +0800
Subject: [PATCH] fix `unsafe` evaluation of objects

---
 lib/compress.js             |  1 +
 test/compress/properties.js | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/lib/compress.js b/lib/compress.js
index 1f58b390..5748dfcb 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4486,6 +4486,7 @@ merge(Compressor.prototype, {
         if (def) {
             return def.optimize(compressor);
         }
+        if (is_lhs(self, compressor.parent())) return self;
         if (compressor.option("unsafe") && self.expression instanceof AST_Object) {
             var values = self.expression.properties;
             for (var i = values.length; --i >= 0;) {
diff --git a/test/compress/properties.js b/test/compress/properties.js
index c2c43f69..c8a85697 100644
--- a/test/compress/properties.js
+++ b/test/compress/properties.js
@@ -804,3 +804,21 @@ issue_2256: {
         g.keep = g.g;
     }
 }
+
+lhs_prop: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(++{
+            a: 1
+        }.a);
+    }
+    expect: {
+        console.log(++{
+            a: 1
+        }.a);
+    }
+    expect_stdout: "2"
+}