Comment_attachment.comment_bounds_collector constraint 'a = Js_parser.Loc.tinherit Js_parser.Flow_ast_mapper.mapperval mutable first_leading : (Js_parser.Loc.t * Js_parser__Flow_ast.Comment.t')
                              optionval mutable last_trailing : (Js_parser.Loc.t * Js_parser__Flow_ast.Comment.t')
                              optionmethod comment_bounds : (Js_parser.Loc.t * Js_parser__Flow_ast.Comment.t')
                          option
                        * (Js_parser.Loc.t * Js_parser__Flow_ast.Comment.t')
                            optionmethod collect_comments : 'internal. (Js_parser.Loc.t, 'internal)
                                       Js_parser.Flow_ast.Syntax.t ->
  unitmethod collect_comments_opt : (Js_parser.Loc.t,
                                Js_parser.Loc.t Js_parser__Flow_ast.Comment.t
                                  list)
                                Js_parser.Flow_ast.Syntax.t
                                option ->
  unitmethod visit_leading_comment : Js_parser.Loc.t Js_parser__Flow_ast.Comment.t ->
  unitmethod visit_trailing_comment : Js_parser.Loc.t Js_parser__Flow_ast.Comment.t ->
  unitmethod syntax : 'internal. (Js_parser.Loc.t, 'internal)
                             Js_parser.Flow_ast_mapper.Ast.Syntax.t ->
  (Js_parser.Loc.t, 'internal) Js_parser.Flow_ast_mapper.Ast.Syntax.t