mistransformation when comment is below last argument in type list

[matthargett]

export type Thenable<R> = {
	andThen: <U>(
		self: Thenable<R>,
		onFulfill: (R) -> () | _Thenable<U> | U,
		onReject: (error: any) -> () | _Thenable<U> | U
	-- note: need union type packs to parse () | Thenable<U>
	) -> nil | _Thenable<U>,
}