On Thu, Nov 14, 2024 at 01:17:54AM +0100, Waldek Hebisch wrote:
> On Wed, Nov 13, 2024 at 12:11:50PM +0100, 'Ralf Hemmecke' via FriCAS -
> computer algebra system wrote:
> > The output of the following function is strange.
> > Why is dbgPrint executed twice?
> >
> > %%% (9) -> fooo(2)
> > Compiling function bar with type (Integer, Integer) -> List(Integer)
> >
> > Compiling function fooo with type Integer -> Integer
> > [:> , ab, [1, 2]]
> > [:> , ab, [1, 2]]
> >
> > (9) 2
> > Type: PositiveInteger
>
> > fooo(n: ZZ): ZZ == (_
> > n < 2 => error "argument must be > 2";_
> > [P1n, Q1n, R1n] := bar(1, n);_
> > Q1n)
>
> Concerning reasons, in interpreter such assignment uses pattern
> matching. 'bar' is evaluated once to get argument to pattern
> matching function. But assignment also produces a value and
> 'bar' is evaluated second time to get (ignored) return value
> of the assignment.
I have now commited fix for this to the trunk.
--
Waldek Hebisch
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