On Wed, Apr 23, 2025 at 11:33:23AM +0200, 'Ralf Hemmecke' via FriCAS - computer 
algebra system wrote:
> When I compile this ...
> 
> ========================
> )abbrev package FOO Foo
> ZZ ==> Integer
> LZZ ==> List ZZ
> LLZZ ==> List LZZ
> Foo: with
>     kleiner: (LLZZ, LLZZ) -> Boolean
>   == add
>     kleiner(x: LLZZ, y: LLZZ): Boolean == x <$LLZZ y
> ========================
> 
> I get
> 
<snip>
>    >> Apparent user error:
>    not known that (List (List (Integer))) has (AND (has (List (List
> (Integer))) (finiteAggregate)) (has (List (Integer)) (OrderedSet)))

As I wrote this was a bug.  I have now commited a change that
mostly fixes this, in particular I can compile your program.
AFACS this is not a complete fix, there still may be troubles
in some special cases, but should be much better than before.

-- 
                              Waldek Hebisch

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