Ast_helper.CtfClass type fields
val mk : 
  ?loc:loc ->
  ?attrs:attrs ->
  ?docs:Docstrings.docs ->
  Parsetree.class_type_field_desc ->
  Parsetree.class_type_fieldval attr : 
  Parsetree.class_type_field ->
  Parsetree.attribute ->
  Parsetree.class_type_fieldval inherit_ : 
  ?loc:loc ->
  ?attrs:attrs ->
  Parsetree.class_type ->
  Parsetree.class_type_fieldval val_ : 
  ?loc:loc ->
  ?attrs:attrs ->
  str ->
  Asttypes.mutable_flag ->
  Asttypes.virtual_flag ->
  Parsetree.core_type ->
  Parsetree.class_type_fieldval method_ : 
  ?loc:loc ->
  ?attrs:attrs ->
  str ->
  Asttypes.private_flag ->
  Asttypes.virtual_flag ->
  Parsetree.core_type ->
  Parsetree.class_type_fieldval constraint_ : 
  ?loc:loc ->
  ?attrs:attrs ->
  Parsetree.core_type ->
  Parsetree.core_type ->
  Parsetree.class_type_fieldval extension : 
  ?loc:loc ->
  ?attrs:attrs ->
  Parsetree.extension ->
  Parsetree.class_type_fieldval attribute : ?loc:loc -> Parsetree.attribute -> Parsetree.class_type_fieldval text : Docstrings.text -> Parsetree.class_type_field list