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Predicate cli_debug_opt_meta/2
 cli_debug_opt_type(-Flag, -Option, -Type)
 cli_debug_opt_help(-Option, -Message)
 cli_debug_opt_meta(-Option, -Arg)
Implements opt_type/3, opt_help/2 and opt_meta/2 for debug arguments. Applications that wish to use these features can call these predicates from their own hook. Fot example: 
opt_type(..., ..., ...).	% application types
opt_type(Flag, Opt, Type) :-
    cli_debug_opt_type(Flag, Opt, Type).
% similar for opt_help/2 and opt_meta/2

main(Argv) :-
    argv_options(Argv, Positional, Options0),
    cli_parse_debug_options(Options0, Options),
    ...
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