better arguments aliasing for arrow functions, add it to block binding - fixes #52

test/fixtures/syntax/arrow-functions/arguments/actual.js

@@ -1,10 +1,10 @@
-function outer() {
+function one() {
   var inner = () => arguments;
   return [].slice.call(inner());
 }
-console.log(outer(1, 2));
+one(1, 2);
 
-function outer() {
+function two() {
   var inner = () => arguments;
 
   var another = function () {
@@ -13,4 +13,22 @@ function outer() {
 
   return [].slice.call(inner());
 }
-console.log(outer(1, 2));
+two(1, 2);
+
+function three() {
+  var fn = () => arguments[0] + "bar";
+  return fn();
+}
+three("foo");
+
+function four() {
+  var fn = () => arguments[0].foo + "bar";
+  return fn();
+}
+four({ foo: "foo" });
+
+function five(obj) {
+  var fn = () => obj.arguments[0].foo + "bar";
+  return fn();
+}
+five({ arguments: ["foo"] });

test/fixtures/syntax/arrow-functions/arguments/expected.js

@@ -1,11 +1,11 @@
-function outer() {
+function one() {
   var _arguments = arguments;
   var inner = function () { return _arguments; };
   return [].slice.call(inner());
 }
-console.log(outer(1, 2));
+one(1, 2);
 
-function outer() {
+function two() {
   var _arguments2 = arguments;
   var inner = function () { return _arguments2; };
 
@@ -16,4 +16,30 @@ function outer() {
 
   return [].slice.call(inner());
 }
-console.log(outer(1, 2));
+two(1, 2);
+
+function three() {
+  var _arguments4 = arguments;
+  var fn = function () {
+    return _arguments4[0] + "bar";
+  };
+  return fn();
+}
+three("foo");
+
+function four() {
+  var _arguments5 = arguments;
+  var fn = function () {
+    return _arguments5[0].foo + "bar";
+  };
+  return fn();
+}
+four({ foo: "foo" });
+
+function five(obj) {
+  var fn = function () {
+    return obj.arguments[0].foo + "bar";
+  };
+  return fn();
+}
+five({ arguments: ["foo"] });

test/fixtures/syntax/block-binding/arguments/actual.js

@@ -0,0 +1,6 @@
+(function () {
+  if (true) {
+    let a = arguments[0];
+    console.log(a);
+  }
+})(1);

test/fixtures/syntax/block-binding/arguments/expected.js

@@ -0,0 +1,9 @@
+(function () {
+  if (true) {
+    var _arguments = arguments;
+    (function () {
+      var a = _arguments[0];
+      console.log(a);
+    })();
+  }
+})(1);