[mercury-users] undefined symbol `::/2'.

[Richard A. O'Keefe]

"Matthews, John" <John.Matthews at compaq.com> wrote:
	:- pred between(int,int,int).
	:- mode between(in,in,in) is semidet.
	:- mode between(in,out,in) is multi.
	
As the original inventor of between/3, I should point out 
that the standard interface for between/3 in Prolog is

	between(Lower_Bound, Upper_Bound, I)

Amongst other things, this meant that between(0,N) could be passed
around usefully as a closure in Prolog.  While that advantage does
not apply to Mercury, there doesn't seem to be any advantage to be
gained by changing the argument order.

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