Ast_helper.RfRow fields
Row fields
val mk : 
  ?loc:Astlib.Location.t ->
  ?attrs:Astlib.Ast_500.Parsetree.attribute list ->
  Astlib.Ast_500.Parsetree.row_field_desc ->
  Astlib.Ast_500.Parsetree.row_fieldval tag : 
  ?loc:Astlib.Location.t ->
  ?attrs:Astlib.Ast_500.Parsetree.attribute list ->
  Astlib.Ast_500.Asttypes.label Astlib.Location.loc ->
  bool ->
  Astlib.Ast_500.Parsetree.core_type list ->
  Astlib.Ast_500.Parsetree.row_fieldval inherit_ : 
  ?loc:Astlib.Location.t ->
  Astlib.Ast_500.Parsetree.core_type ->
  Astlib.Ast_500.Parsetree.row_field