From: NoSpamPleaseButThisIsValid2@gmx.net   
      
   Joe S. wrote:   
   > Hello,   
   > I have a unit with a function that provides a generic advanced   
   > keyboard input handler. A syntax checker, a value checker, and a   
   > validation checker need to be plugged in:   
   >   
   > TValidation = function(str:string; var message:string):boolean;   
   >   
   > The idea is that the user can write a procedure for validating a   
   > particular type of input, and pass it to the various input procedures.   
   > Here's an example:   
   >   
   > write('Enter an even integer between 4 and 18: ');   
   > nreadln(n, mycheck);   
   >   
   > nreadln handles integers, and mycheck is of TValidation. The problem   
   > is that if mycheck is in the main program, BP7 reports error 143   
   > (Invalid procedure or function reference) on the nreadln line and   
   > won't compile. Everything is syntactically correct, because it works   
   > if mycheck is moved to a different unit which is used by the input   
   > mechanism unit. It just doesn't work if it is where it needs to be -   
   > in the main program. Any ideas?   
      
   Did you put {$F+} ... {$F-} around your procedure or did you declare it   
   as "far"? If not, then do it.   
      
   Wolf   
      
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