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   comp.lang.forth      Forth programmers eat a lot of Bratwurst      117,927 messages   

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   Message 117,298 of 117,927   
   Ruvim to dxf   
   Re: QUIT and ABORT   
   06 May 25 10:58:08   
   
   From: ruvim.pinka@gmail.com   
      
   On 2025-05-06 06:55, dxf wrote:   
   > On 6/05/2025 3:29 am, Ruvim wrote:   
   >> On 2025-05-05 08:11, dxf wrote:   
   >>> ...   
   >>> However modifying it to do so gives these results:   
   >>>   
   >>> 1 .( a ) cr -56 throw .( b )   
   >>>   
   >>>     'a' is displayed and the stack is: 1   
   >>   
   >> This violates the behavior of `throw` specified in 9.6.1.2275,   
   >> because if there is no a user's exception frame, the data stack must be   
   emptied.   
   >>   
   >> The table 9.1 in Forth-2012 (or 9.2 in Forth-94) does not affect the   
   behavior of `throw` at all.   
   >   
   > Except THROW special-cased codes -1 and -2 effectively reserving their   
   behaviour.   
   > One can speculate why ANS didn't do so for -56 but to my mind QUIT when   
   implemented   
   > should function as expected i.e. -56 THROW uncaught should perform QUIT.   
   >   
      
   You suggest to make -56 a special case in `throw`.  But what is the   
   rationale for this?   
      
   Yes, -1 and -2 are special cases in 9.6.1.2275 (when there is no user   
   exception frame). But for those cases it *only* specifies what message   
   shall be displayed, and *nothing more*. The standard should have   
   specified this messages anyway, and the only choice was which section to   
   specify it in.   
      
      
   --   
   Ruvim   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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