OCaml compiler library : Build_path_prefix_map

`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`