arrows fix for object literal methods containing arguments

lib/compress.js

@@ -5414,6 +5414,7 @@ merge(Compressor.prototype, {
         // p(){return x;} ---> p:()=>x
         if (compressor.option("arrows")
             && compressor.parent() instanceof AST_Object
+            && !self.value.uses_arguments
             && self.value.body.length == 1
             && self.value.body[0] instanceof AST_Return
             && self.value.body[0].value

test/compress/harmony.js

@@ -1153,3 +1153,40 @@ array_literal_with_spread_4: {
     ]
     node_version: ">=6"
 }
+
+methods_using_arguments: {
+    options = {
+        arrows: true,
+    }
+    input: {
+        console.log(({
+            m() {
+                return arguments[0];
+            }
+        }).m("PASS"));
+
+        console.log(new class {
+            m() {
+                return arguments[0];
+            }
+        }().m("PASS"));
+    }
+    expect: {
+        console.log(({
+            m() {
+                return arguments[0];
+            }
+        }).m("PASS"));
+
+        console.log(new class {
+            m() {
+                return arguments[0];
+            }
+        }().m("PASS"));
+    }
+    expect_stdout: [
+        "PASS",
+        "PASS",
+    ]
+    node_version: ">=6"
+}