914695 - Arrow functions should not create an "arguments" binding

Status: RESOLVED DUPLICATE of bug 889158

(Core :: JavaScript Engine, defect)

Description

[Andy Wingo [:wingo]]

I am told that SM's arrow functions create an arguments binding.  That should not be the case; see http://people.mozilla.org/~jorendorff/es6-draft.html#sec-9.1.16.11, step 7.  Arrow functions have "lexical" type.

Comment 1

[Nathan Williams]

The spec link appears to have changed.  I think this is current: http://people.mozilla.org/~jorendorff/es6-draft.html#sec-arrow-function-definitions-runtime-semantics-evaluation

In this example, the arrow function should ignore the "2" passed to it and print the "1" passed to the lexically enclosing function instead.

function f() {
  return (() => arguments[0])(2);
}
console.log(f(1)); // prints "2"; should print "1"

Comment 2

[Caitlin Potter [:caitp]]

Is this a dupe of #889158 ?

Comment 3

[Jeff Walden [:Waldo]]

Yeah, think so.