I imagine that given/when will be kept. However, the perception is that their current implementation is highly flawed. A new implementation will probably break some existing uses of given/when, so it makes sense to start warning people about this.
given originally used the lexical $_ rather than the global $_ (but this has changed in 5.18). This was confusing for many people.
when adds a whole extra layer of weird.
Quick quiz! What does this output?
use v5.10;
use strict;
no warnings;
sub two () { 2 }
sub three { 3 }
sub english_number {
my $number = shift;
given ($number) {
when ( 1 ) { return 'one' }
when ( two ) { return 'two' }
when ( three ) { return 'three' }
when ( 4 ) { return 'four' }
default { return 'more' }
}
}
say english_number($_) for 1..5;
use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name
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