Why is this an issue?

An implicitly created net is not referenced elsewhere in the design. This is often a typo in the name and not intentional.

How to fix it

Code examples

Noncompliant code example

module fly(output x);
  assign x = 1;
endmodule

module top;
  logic typo;
  fly fly1(typa); // Noncompliant: 'typa' instead of 'typo'
endmodule

Compliant solution

module fly(output x);
  assign x = 1;
endmodule

module top;
  logic typo;
  fly fly1(typo);
endmodule