Witness of a field, that is an item in a record type. The first parameter is the record type, the second is the type of the field. Example:
type t = { x : int ; y : string }This type has two fields. for each of them we'll have a corresponding Field.t
val field_x : (t, int) Field.t val field_y : (t, string) Field.t
val label : ('a, 'b) t -> stringThe name of the field as it is given in the concrete syntax Examples:
{ x : int; (* "x" *)
foo : string; (* "foo" *)
bar : float; (* "bar" *)
}val index : ('a, 'b) t -> intThe 0-based index of the field in the list of all fields for this record type. Example:
type t = {
x : int; (* 0 *)
foo : string; (* 1 *)
bar : string; (* 2 *)
}val get : ('record, 'field) t -> 'record -> 'fieldField accessors. This corresponds to the dot operation. Field.get bar_field t returns the field bar of the record value t, just the same as t.bar
val is_mutable : ('a, 'b) t -> boolreturn whether the field is mutable, i.e. whether its declaration is prefixed with the keyword mutable
val tyid : ('a, 'field) t -> 'field Typename.treturn the type_name of the arguments. Might be used to perform some lookup based on it
val internal_use_only : ('a, 'b) Field_internal.t -> ('a, 'b) t