Expression.Array
type ('M, 'T) element =
| Expression of ('M, 'T) Expression.t
| Spread of ('M, 'T) SpreadElement.t
| Hole of 'M
type ('M, 'T) t = {
elements : ('M, 'T) element list;
comments : ('M, 'M Comment.t list) Syntax.t option;
}