fix `unsafe` evaluation of objects (#2388)

2 files changed, 19 insertions, 0 deletions

diff --git a/lib/compress.js b/lib/compress.js
index c7e08638..cef5d75f 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4492,6 +4492,7 @@ 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"
+}