From 8d156b51fe72906800189ec70a4b8ba23e6db937 Mon Sep 17 00:00:00 2001
From: kzc <kzc@users.noreply.github.com>
Date: Thu, 21 Dec 2017 04:50:26 -0500
Subject: [PATCH] `arrows` fix for object literal methods containing
 `arguments` (#2632)

fixes #2631
---
 lib/compress.js          |  2 ++
 test/compress/harmony.js | 44 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/lib/compress.js b/lib/compress.js
index 59307905..2158191c 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -5414,6 +5414,8 @@ merge(Compressor.prototype, {
         // p(){return x;} ---> p:()=>x
         if (compressor.option("arrows")
             && compressor.parent() instanceof AST_Object
+            && !self.value.uses_arguments
+            && !self.value.uses_eval
             && self.value.body.length == 1
             && self.value.body[0] instanceof AST_Return
             && self.value.body[0].value
diff --git a/test/compress/harmony.js b/test/compress/harmony.js
index ad57e06a..fd0212dd 100644
--- a/test/compress/harmony.js
+++ b/test/compress/harmony.js
@@ -1153,3 +1153,47 @@ array_literal_with_spread_4: {
     ]
     node_version: ">=6"
 }
+
+object_literal_method_using_arguments: {
+    options = {
+        arrows: true,
+    }
+    input: {
+        console.log(({
+            m() {
+                return arguments[0];
+            }
+        }).m("PASS"));
+    }
+    expect: {
+        console.log(({
+            m() {
+                return arguments[0];
+            }
+        }).m("PASS"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+class_method_using_arguments: {
+    options = {
+        arrows: true,
+    }
+    input: {
+        console.log(new class {
+            m() {
+                return arguments[0];
+            }
+        }().m("PASS"));
+    }
+    expect: {
+        console.log(new class {
+            m() {
+                return arguments[0];
+            }
+        }().m("PASS"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}