On Tue, Jan 5, 2010 at 11:18 AM, Ovid
<publiustemp-perl6langua...@yahoo.com> wrote:
> --- On Tue, 5/1/10, Jonathan Scott Duff <perlpi...@gmail.com> wrote:
>
>> From: Jonathan Scott Duff <perlpi...@gmail.com>
>
>> I'd imagine that the functionality will fall
>> out of the ability to have nice failures because surely
>> something like the following works now:
>>
>> subset Filename of Str where { $_ ~~ :f or
>> fail "No such file: '$_'" }
>> Perhaps s/fail/die/, but that seems like a means
>> to your desired end.
>
> Ah, the die works fine. However, "fail" causes that sub call to be skipped
> altogether:
>
> subset Filename of Str where { $_ ~~ :f or fail "$_ is not a filename" };
>
> sub foo (Filename $name) {
> say "Houston, we have a filename: $name";
> }
>
> foo($*EXECUTABLE_NAME);
> say "before";
> foo('no_such_file');
> say "after";
>
> Output:
>
> Houston, we have a filename: /Users/ovid/bin/perl6
> before
> after
>
> Is this a bug or just documented behavior that I don't know about?
fail just returns an uncalled exception. What does that do in a where block?
--
Solomon Foster: colo...@gmail.com
HarmonyWare, Inc: http://www.harmonyware.com
