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From: anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups: comp.lang.forth
Subject: Re: QUIT and ABORT
Date: Sat, 03 May 2025 16:02:26 GMT
Organization: Institut fuer Computersprachen, Technische Universitaet Wien
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dxf <dxforth@gmail.com> writes:
>Checking the doc it says:
>
>  9.3.5 Possible actions on an ambiguous condition
>
>  A system choosing to execute THROW when detecting one of the ambiguous
>  conditions listed in table 9.3.6 shall use the throw code listed there.

Calling ABORT or QUIT is not an ambiguous condition, so that section
plays no role there.

>So while CATCH and THROW are compulsory (EXCEPTION wordset), there is no
>requirement to implement any of the codes listed in the table.  Only if
>the EXCEPTION EXT wordset is implemented must the codes for ABORT and
>ABORT" be used.  Thus a system may implement the following if it wishes:
>
>  : QUIT -56 THROW ;

That would not be a standard system, because in a standard system QUIT
must do what 6.1.2050 QUIT says, and "-56 THROW" is not a correct
implementation of that.

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
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