What does [-1:0] mean in Verilog?

Question

In my code i wrote:

output [numSize-1:0] index;

numSize is a parameter that can be zero. What is the meaning of this? What is this gonna be synthesized to?

Answer 1

The assignment of output [-1:0] index would allow you to access index[-1] and index[0].

There is no preclusion to using negative values in the range of a vector in Verilog.