sig type path = string type path_prefix = string type error_message = string val encode_prefix : Build_path_prefix_map.path_prefix -> string val decode_prefix : string -> (Build_path_prefix_map.path_prefix, Build_path_prefix_map.error_message) Stdlib.result type pair = { target : Build_path_prefix_map.path_prefix; source : Build_path_prefix_map.path_prefix; } val encode_pair : Build_path_prefix_map.pair -> string val decode_pair : string -> (Build_path_prefix_map.pair, Build_path_prefix_map.error_message) Stdlib.result type map = Build_path_prefix_map.pair option list val encode_map : Build_path_prefix_map.map -> string val decode_map : string -> (Build_path_prefix_map.map, Build_path_prefix_map.error_message) Stdlib.result val rewrite_opt : Build_path_prefix_map.map -> Build_path_prefix_map.path -> Build_path_prefix_map.path option val rewrite : Build_path_prefix_map.map -> Build_path_prefix_map.path -> Build_path_prefix_map.path end