Re: RFC 179 (v1) More functions from set theory to manipulate arrays

[Tom Christiansen]

>If it were possible to assign to the keys of a hash, we'd be 
>a lot closer to our ideal:

>  keys(%intersection) = map { exists $set1{$_} ? ( $_ => 1 ) : () } keys<SNIP>

>but this is not currently legal perl.

    keys %HASH = LIST;

is really

    @HASH{ LIST } = ();

--tom