Just noticed that use in js/xpconnect/ can be removed now. Need to replace non-standard expression closure with one of: * function declaration * function expression * arrow function before fixing bug 1083458. converting rules are following: * function declaration add `return` and braces * standalone named function expression add `return` and braces * function expression, contains `arguments` add `return` and braces * standalone anonymous function expression contans and receives `this` (Array.filter, bind, etc) convert to arrow function, and remove code passing |this| * standalone anonymous function expression contans no `this` convert to arrow function * property with anonymous function expression, contains `this` add `return` and braces * property with anonymous function expression, contains no `this`, short body convert to arrow function * property with anonymous function expression, contains no `this`, long body add `return` and braces * property with named function expression add `return` and braces * getter property add `return` and braces * setter property add braces I'll post a patch shortly.

https://hg.mozilla.org/integration/mozilla-inbound/rev/944ba8373890a00700ea0596a70267d36c7180a7 Bug 1215937 - Remove use of expression closure from js/xpconnect/. r=bholley