Serge D. Mechveliani wrote:
> 
> 
> 2. Initially there was no  "coerce(t) == "
>    The interpreter reported that  coerce  is missed from  BTree.
> What kind of  coerce ?
> Finally I guessed that it computes  tree1(1),  but cannot output.
> So, probably,  coerce(t) : OutputForm == ...  is needed.

Yes, for printed output you need this coercion.
 
-- 
                              Waldek Hebisch
[email protected] 

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