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Postings from July 2010
Quoth nick@ccl4.org (Nicholas Clark):
> On Tue, Jul 13, 2010 at 01:11:11PM +0000, �var Arnfj�r� Bjarmason wrote:
>
> > Of course we can't liberally change things that are documented to be
> > undefined as liberally as a C compiler would, becuase there's only one
> > perl(1) but multiple cc(1)'s.
>
> But whatever we call it, that's the key problem. There is only one
> implementation, and as that implementation strives hard to internally avoid
> C undefined behaviour, its output will be deterministic, in some fashion.
> Hence people come to rely on the current behaviour of the implementation,
> documented or not.
Quite. And
print $i++, $i++;
has DWIM forever (probably since perl 1). I'm not saying we *cannot*
change it, just that any change needs to be either only within the scope
of a lexical pragma or to go through a full deprecation cycle with
mandatory warnings before it changes.
Ben
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