Containers.MapExtSigSourceInput signature of the functor Map.Make.
type map_printer = {print_empty : string;Special text for empty maps
*)print_begin : string;Text before the first binding
*)print_arrow : string;Text between a key and its value
*)print_sep : string;Text between two bindings
*)print_end : string;Text after the last binding
*)}MOPSA Tells how to print a map.
Output signature of the functor MapExt.Make.