On Thursday, January 30, 2020 at 8:54:56 AM UTC-8, Ties Laarakker wrote:
>
> There's a probem with multiple substitutions in Sage 9.0.
>
>
>
> sage: var('x,y')
>
> (x, y)
>
> sage: (*1*/x)(x=*1*/y, y =*42*)
>
> 42
>
>
> That is indeed very strange an worrisome. For further diagnostics: this
also happens with a straight "subs":
(1/x).subs({x:1/y, y:42})
This calls straight into Pynac, so a change there must have caused this
(8.9 has the same problem).
It seems to depend on the actual substitution:
(1/x).subs({x:y,y:42})
works fine. This should definitely be filed as a bug and reported
"upstream" (I'm not so sure pynac gets much usage outside sage).
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