VERILOG2063: Signing keywords with no effect should be removed

Summary

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Reliability	Security	Maintainability	Code attribute	Effort to fix	Tags
MEDIUM	-	-	Intentionality | Logical	10min	synthesis, vscode, simulation, linter

Description

For a non-ANSI instance port or function body port declaration, the port I/O specifies a signing keyword but the actual data type of the port does not permit that signing to take effect.

Noncompliant code example

module fly(a);
  input unsigned a;
  int a;
endmodule

Compliant solution

module fly(a);
  input a;
  int a;
endmodule

Parameters

No parameters.