Newbie question

[Fausto A. A. Barbuto]

Hello,

I'm a newbie to Mathics and I wonder what's wrong with the statement below:

mset = Compile[{{d, _Complex}}, Module[{z = d, n = 0}, While[Abs[z] < maxsize && n < maxiter, z = z ^ (1.5) + c; n++]; n]];

It throws the following error(?) message:

Compile::invar:

Variable _Complex should be {symbol, type} annotation.

Any help will be much appreciated! Thanks!

Fausto