[m-dev.] Introduce !! rather than ^elem() for indexing

[Simon Taylor]

On 09-Oct-2001, Ralph Becket <rafe at cs.mu.OZ.AU> wrote:
> I believe that Haskell uses !! to access array members (and possibly
> list members etc. too).
> 
> `A !! I' is syntactically more economical than the current Mercury
> convention of using `A ^ elem(I)'.  However, to make substitution of
> the form `A !! I := X' parse would require some work.

I don't think it works very well when field accesses or updates are
nested. To me,
	X !! 1 ^ field := Value
doesn't (mentally) parse as well as
	X ^ elem(1) ^ field := Value.

> Any takers?

Not me.

Simon.
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