On Wed, Aug 13, 2014 at 7:18 PM, guilhermebla...@gmail.com < guilhermebla...@gmail.com> wrote:
> When is this planned to go through voting process? > Before voting I'd like to have some opinions on the behavioral differences the proposal introduces. In particular I'd like to know whether we are okay with changing order of evaluation in some places. We document that evaluation order is undefined, we document that it can change without warning between versions and that it is inconsistent within one version. However in the current implementation evaluation is usually left-to-right. The AST implementation introduces some places where evaluation is explicitly right-to-left, and not just incidentally. So basically the question is whether we are committed to things like $a[$i++] = $i++ or $a[$i++][$i++] = $j being undefined behavior, in which case order doesn't matter. If not, I can preserve left-to-right behavior here (CVs notwithstanding of course), but it would come at the cost of a good bit of additional complexity in the implementation (I suspect that I'd have to reintroduce parts of the bp stack to properly shuffle the oplines around). My personal opinion is that things like $a[$i++] = $i++ have zero practical relevance (and also think that anyone using something like this deserves any breakage he gets). I'd rather save some lines of code than maintain any behavior guarantees for that. But some people have contrary opinions on this, so I'm bringing up the point for discussion. Nikita
