Hello Alex,

Thank you very much, that's it.

In fact, I have tried this solution before asking on the list, however as I am still not very fluent in Lisp I have written :

: (be intro

    (prin "Hello world\n") )

without the two >> () << at the beginning of the defintion of the predicate!!



Le 23/11/2016 à 09:27, Alexander Burger a écrit :
   : (be intro ()
       (prin "Hello world\n") )
    -> intro

    :  (? (intro))
    Hello world
    -> T

Is this what you mean?

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