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  {$I<+│->}
 
  Description
 
    Switches between two settings that control the kind of
    error-checking code generated by the compiler for I/O calls.
    The default is {$I+}.
 
    {$I+}   Turns on checking of an I/O call. In this state, an
            I/O error causes an I/O run-time error.
 
    {$I-}   Turns off I/O checking. In this state, an I/O error
            doesn't cause an I/O run-time error. Instead, it sets the
            IOResult function to return a nonzero number.