On Sat, Apr 23, 2005 at 09:50:26PM +0200, Juerd wrote:
> Autrijus Tang skribis 2005-04-24  3:47 (+0800):
> >     $x := @a[0];    # vivified or not?
> Vivified, because you're taking a reference (not at language level) and
> you can't have a reference (at internal level) pointing to something
> that doesn't exist. At language level, you can, but only symbolically.

Okay.  Implemented as r2260, with full call-by-value semantics as
defined by Larry's previous post. `bindings.t` passes under either
semantics, as expected.

Please sanity-check the following:

    pugs> my ($x, @a); $x := @a[-1]; $x = 3; @a
    *** Error: Modification of non-creatable array value attempted

    pugs> my ($x, @a); $x := @a[0]<x>[1]<y>; $x = 3; @a[0]<x>[1]<y>

    pugs> my ($x, @a); $x := [EMAIL PROTECTED]; $x = 3
    *** Error: Can't modify constant item


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