Yes, constants may contain mutable data. But that's just as in other
languages. It is true that you can say
l: List Integer == [1,2,3];
l.1 := 4;
but in my opinion, you are not really modifying l, but rather l.1, and that's a
different story.
And I would even need mutable constants. I want to define a powerseries
y = 1 + x * y*y
as a constant. The only thing I want a user then to do is to ask for
coefficients. But in order to provide such an infinite constant I need a
way to compute it without having the compiler run infinitely long.
Ralf
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