./ivltests/sys_func_task_error.v:7: Error: System task/function $this_icarus_call_should_not_exist() is not defined by any module.
./ivltests/sys_func_task_error.v:10: Error: $sscanf() is a system function, it cannot be called as a task.
./ivltests/sys_func_task_error.v:12: Error: $display() is a system task, it cannot be called as a function.
vsim: Program not runnable, 3 errors.