From 127ab175f0f3c6039a6cb66bb5582e7b9264c545 Mon Sep 17 00:00:00 2001
From: alexlamsl <alexlamsl@gmail.com>
Date: Mon, 23 Oct 2017 00:05:57 +0800
Subject: [PATCH] minor clean up

---
 lib/compress.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/compress.js b/lib/compress.js
index 7c971b97..7085fcb3 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2374,7 +2374,8 @@ merge(Compressor.prototype, {
                     }
                     return node;
                 }
-                if (node instanceof AST_Definitions && !(tt.parent() instanceof AST_ForIn && tt.parent().init === node)) {
+                var parent = tt.parent();
+                if (node instanceof AST_Definitions && !(parent instanceof AST_ForIn && parent.init === node)) {
                     // place uninitialized names at the start
                     var body = [], head = [], tail = [];
                     // for unused names whose initialization has
@@ -2466,7 +2467,7 @@ merge(Compressor.prototype, {
                         && !((def = def.definition()).id in in_use_ids)
                         && self.variables.get(def.name) === def) {
                         if (node instanceof AST_Assign) {
-                            return maintain_this_binding(tt.parent(), node, node.right.transform(tt));
+                            return maintain_this_binding(parent, node, node.right.transform(tt));
                         }
                         return make_node(AST_Number, node, {
                             value: 0