Module called too many times?

I have some code where a particular Module "M()" is invoked 4 times, but
only one of those times is actually displayed, because I only put "!" in
front of one of the references; the other 3 should be ignored.  And yet
when I use echo() inside M(), it appears 4 times.  It seems that while I
have only asked for ONE of the invocations to be calculated, in fact all
four are.  One can hope that it is actually calculated only once, and
then pulled from a cache for the other 3 times, but this is not what I
expected.  That is, in the code below, I thought that modules A(), B(),
and C() would be ignored entirely.

Not sure if this is important or just a curiosity.  Not sure whether
there are performance issues lurking there.

Jon


module M() {
     cube(1);
     echo("hello");
}

module A()
     M();

module B()
     M();

module C()
     M();

A();
B();
C();

!M();


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No, there's only one shown due to the ! (root modifier).

The root modifier only applies to display, not to evaluation,
so all the calls are done to evaluate the full script. That's
intentional at this point.

ciao,
  Torsten.

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