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Postings from June 2022
On Mon, Jun 06, 2022 at 11:05:59PM +0100, Neil Bowers wrote:
> This is a retrospective Pre-RFC for a proposal from Curtis, for which he submitted a draft RFC[1]. We nearly missed it when reviewing proposals in-flight in our PSC meeting last week, and decided to trigger a discussion here, to reinforce the process.
>
> Beginning and casual Perl programmers regularly get confused / caught out by the requirement to add `1;` at the end of their modules. To add to their confusion, there are plenty of modules on CPAN with humorous alternatives for "1".
>
> Curtis proposed a feature called something like yield_true, which would result in the current file yielding a true value on successful compilation. So a module could then look like this:
>
> package Zork;
> use feature 'yield_true';
>
> # code
>
> This is not a feature we’d expect people to use explicitly, but would be part of the version bundle, so you’d get it for free with a future `use v5.XY`.
Thinking about implementation, how should this behave if the included file was:
package Zork {
use feature 'yield_true';
}
remembering features (and use vX.XX) are lexical.
Or perhaps less reasonably:
package Zork;
{
{
{
use feature 'yield_true';
}
}
}
The true module on CPAN works by checking the filename between when
"true"->import() is called and when the check function for the
leaveeval is called, which a #line directive might break.
Tony
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