[m-users.] Converting types to printable form

[Sean Charles (emacstheviking)]

How do you convert a discriminated union to a printable string? I have this:

    % Character classification types.
:- type char_type ---> ws; chr; op; cp; ol; cl; om; cm; sq; dq; tk.
:- type tokstate
        --->    skip_ws
        ;       eat_token.

Do I have to explicitly code a predicate for each type I define or not? In Haskell I can just add (show) to the definition and it does the write(!) thing. Can Mercury do that other than using io.print_line, sometimes I don’t want a new line!

Thanks
Sean


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