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Re: [Caml-list] Matching when
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Date: -- (:)
From: Luc Maranget <luc.maranget@i...>
Subject: Re: [Caml-list] Matching when
> 
> #include <std.flx>
> 
> match (2,1) with
> | ( (?x when x>=1), (?y when y >=1)) when x >=2 => { print "YES"; endl; }
> | _ => { print "NO"; endl; }
> endmatch;
> 
> wherein 'when' expressions are part of patterns, and as you can see,
> can be nested within a pattern -- making the grammar for patterns
> and expressions mutually recursive.
> 
> I'm curious as to what problems you perceive with
> the mutual recursion.
> 
> -- 
> John Max Skaller, mailto:skaller@ozemail.com.au
> snail:10/1 Toxteth Rd, Glebe, NSW 2037, Australia.
> voice:61-2-9660-0850
> 
> 
> 
> 

Nothing special, it is just an important change for a questionable
benefit....

Changing that would change many things in the front end, in
particular, the type-checker.

May be easy, may not be...



--Luc
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