# COMPAT rule - function with ref arg shall be automatic

- Source URL: https://github.com/AsFigo/pyslint/issues/159

Add a new rule to check that functions with ref arguments are declared automatic.

```verilog
module x;
  integer x1;
  function  func (ref integer a[]);
    $display ("%p", a);
  endfunction
 
  initial begin
    integer a [];
    a = {1,2,3,4,5};
    x1=func(a);
  end
endmodule 
```

```log
 reference argument is illegal inside static task-function declaration.
```