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Postings from March 2023
Graham Knop wrote: >Relevant discussions: Thanks, useful references. Will look. First thing that I can respond to: >Proposal to deprecate version "downgrading": >https://www.nntp.perl.org/group/perl.perl5.porters/2022/02/msg262948.html In the message there, LeoNerd asks: } Have I missed a valid use-case for stepping }backwards within the same scope? Yes, you have. It is generally useful to be able to embed a piece of code from one place into a different context, and we have lexical scoping to enable that sort of thing to be done cleanly. When borrowing code that's written for a particular set of features and strictures, one can easily bring that code's pragmata along with the code itself, and using those pragmata in the local scope will (mostly) set the lexical state appropriately for that code. If one wants to borrow a small piece of code whose prevailing lexical state is expressed in terms of a version pragma, and that version happens to be older than that for which the bulk of one's module is written, then that amounts to a lexical `stepping backwards'. It's just as meaningful a situation as stepping forwards. Prohibiting it would cause an annoyance. It's not fatal to this kind of code reuse, because one could reexpress the prohibited pragma in terms of its constituent strictures, feature bundle, and so on. But there's no good reason to discourage or impede this kind of use. -zeframThread Previous | Thread Next