Ast_helper.OfObject fields
val mk : 
  ?loc:loc ->
  ?attrs:attrs ->
  Parsetree.object_field_desc ->
  Parsetree.object_fieldval tag : 
  ?loc:loc ->
  ?attrs:attrs ->
  Asttypes.label with_loc ->
  Parsetree.core_type ->
  Parsetree.object_fieldval inherit_ : ?loc:loc -> Parsetree.core_type -> Parsetree.object_field