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Postings from December 2021
On Tue, 19 Oct 2021 19:25:04 +0100
"Paul \"LeoNerd\" Evans" <leonerd@leonerd.org.uk> wrote:
> Using the same internals that makes them work it would be quite easy
> to add the oft-requested try/catch/finally syntax:
>
> try {
> say "This happens first";
> }
> catch ($e) {
> say "Oops, a failure happened";
> }
> finally {
> say "This always happens, regardless of success or failure";
> }
>
> A try/catch/finally can be implemented basically the same way as if it
> was written
>
> {
> defer { "finally" code goes here }
>
> try {} catch($e) ... here as normal
> }
I've now written a (currently-draft) PR to implement specifically this
bit of try/catch/finally syntax:
https://github.com/Perl/perl5/pull/19285
It doesn't yet address such questions as `finally` on bare blocks or
other situations.
It also doesn't address the question of how to deparse compiled code
using this syntax, as it is currently implemented by the same optree as
a `defer` block would use, and is thus indistinguishable, in much the
same way that "A and B" and "B if A" would deparse the same way.
--
Paul "LeoNerd" Evans
leonerd@leonerd.org.uk | https://metacpan.org/author/PEVANS
http://www.leonerd.org.uk/ | https://www.tindie.com/stores/leonerd/
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