Class.PrivateField
type ('M, 'T) t = 'T * ('M, 'T) t'
and ('M, 'T) t' = {
key : 'M PrivateName.t;
value : ('M, 'T) Property.value;
annot : ('M, 'T) Type.annotation_or_hint;
static : bool;
variance : 'M Variance.t option;
comments : ('M, unit) Syntax.t option;
}