Precedence in parsing types

It looks to me like this should parse, but it doesn't: ``` var x: number | (string)=>void; ``` It works with added parens: ``` var x: number | ((string)=>void); ``` But if the parser is not too hacky, then maybe it's easy to make the first work? (FWIW, I ran into this in a rest argument, where it would be nice to avoid the extra parens in ``` function foo(...xs: (number | ()=>void)[]): void { } ``` )