Fix arrow function lexical arguments binding, allow rest + arguments

Issue #1547

js/src/frontend/BytecodeCompiler.cpp

@@ -65,13 +65,6 @@ SetSourceMap(ExclusiveContext* cx, TokenStream& tokenStream, ScriptSource* ss)
 static bool
 CheckArgumentsWithinEval(JSContext* cx, Parser<FullParseHandler>& parser, HandleFunction fun)
 {
-    if (fun->hasRest()) {
-        // It's an error to use |arguments| in a function that has a rest
-        // parameter.
-        parser.report(ParseError, false, nullptr, JSMSG_ARGUMENTS_AND_REST);
-        return false;
-    }
-
     RootedScript script(cx, fun->getOrCreateScript(cx));
     if (!script)
         return false;