眾所周知，語句塊中需要用到的變量只能在語句塊最開始定義。

task some_task();          
  // do some stuff          
  // ...          
            
  // want to do some stuff here, but need a new var          
endtask

task some_task();          
  int some_var; // defined here, but used way farther down          
  // doing some stuff          
  // ...          
            
  // do some stuff here with 'some_var'          
endtask

task some_task();
  // do some stuff
  // ...
  
  begin
    int some_var;
    //do some stuff here with 'some_var'
  end
  
  // carry on with other statements
  // ...
endtask

????