Function.Params
type ('M, 'T) t = 'M * ('M, 'T) t'
and ('M, 'T) t' = {
this_ : ('M, 'T) ThisParam.t option;
params : ('M, 'T) Param.t list;
rest : ('M, 'T) RestParam.t option;
comments : ('M, 'M Comment.t list) Syntax.t option;
}