Am 20. Februar 2018 20:20:19 MEZ schrieb Simon Albrecht 
<simon.albre...@mail.de>:
>On 20.02.2018 18:55, Stefano Troncaro wrote:
>> \tieDirectionFromList  #'(-1 1 -1)
>>      %The following gives warning: type check for `direction' failed;
>value 
>> `DOWN' must be of type `direction' %\tieDirectionFromList #'(DOWN UP
>DOWN)
>
>That’s a problem with quoting: try
>\tieDirectionFromList #(list DOWN UP DOWN)
>or, if you were to mix literals and variables,
>\tieDirectionFromList #`(-1 ,UP ,DOWN)
>
>Best, Simon

Maybe this is if some help: https://scheme-book.ursliska.de/scheme/quoting/

Urs

>
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