Cannot use keyword as Javascript method name

[abhirmathur]

Using a keyword such as "then" as an object's method name is not supported.

For example,

let p = new_promise() in p##catch_(fun reason -> reason)

will compile to

p.$$catch(function (reason) { return reason; });

[abhirmathur]

class type promise =
object
    method then_ : 'a -> 'b
    method catch_ : 'a -> 'b
end [@uncurry]

external new_promise : unit -> promise Js.t = "Promise" [@@bs.new] [@@bs.module "sys-bluebird"]

let () =
let p = new_promise() in
(p##then_(fun x -> x + 3))##catch_(fun reason -> reason)

[bobzhang]

catch is a keyword in JS, but it can still be used as method name

[bobzhang]

fixed by #459