From 59a4e56bc81ce96b3ee81ad4f068cfc7d89a4790 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Mon, 3 Apr 2017 12:31:05 +0800
Subject: [PATCH] fix mangleProperties of `undefined` & `Infinity` (#1772)

`NaN` already works by the happy accident of `Number.NaN`

fixes #1770
---
 lib/propmangle.js           |  6 ++++-
 test/compress/issue-1770.js | 48 +++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 test/compress/issue-1770.js

diff --git a/lib/propmangle.js b/lib/propmangle.js
index cfa035d2..c1e8c7e4 100644
--- a/lib/propmangle.js
+++ b/lib/propmangle.js
@@ -44,7 +44,11 @@
 "use strict";
 
 function find_builtins() {
-    var a = [];
+    // NaN will be included due to Number.NaN
+    var a = [
+        "Infinity",
+        "undefined",
+    ];
     [ Object, Array, Function, Number,
       String, Boolean, Error, Math,
       Date, RegExp
diff --git a/test/compress/issue-1770.js b/test/compress/issue-1770.js
new file mode 100644
index 00000000..69df8960
--- /dev/null
+++ b/test/compress/issue-1770.js
@@ -0,0 +1,48 @@
+mangle_props: {
+    mangle_props = {}
+    input: {
+        var obj = {
+            undefined: 1,
+            NaN: 2,
+            Infinity: 3,
+            "-Infinity": 4,
+        };
+        console.log(
+            obj[void 0],
+            obj[undefined],
+            obj["undefined"],
+            obj[0/0],
+            obj[NaN],
+            obj["NaN"],
+            obj[1/0],
+            obj[Infinity],
+            obj["Infinity"],
+            obj[-1/0],
+            obj[-Infinity],
+            obj["-Infinity"]
+        );
+    }
+    expect: {
+        var obj = {
+            undefined: 1,
+            NaN: 2,
+            Infinity: 3,
+            "-Infinity": 4,
+        };
+        console.log(
+            obj[void 0],
+            obj[void 0],
+            obj["undefined"],
+            obj[0/0],
+            obj[NaN],
+            obj["NaN"],
+            obj[1/0],
+            obj[1/0],
+            obj["Infinity"],
+            obj[-1/0],
+            obj[-1/0],
+            obj["-Infinity"]
+        );
+    }
+    expect_stdout: true
+}
-- 
2.34.1