#!/usr/bin/env perl     
#-*-Perl-*-

use v5.16;

my @a = qw<a b c>;
my $b = [@a];

while (my ($i, $v) = each $b) {
    say "$i: $v";
}

while (my ($i, $v) = each [@a]) {
    say "$i: $v";
}

[download]
Trying out the arrayref functionality introduced in 5.14. The first loop executes the expected 3 times, printing the expected values. The second loops infinitely, always giving 0 for $i and 'a' for $v. Hashrefs display the same behavior. 
my $b = {map { $_ => $_ } qw<a b c>};

while (my ($i, $v) = each $b) {
    say "$i: $v";
}

while (my ($i, $v) = each {map { $_ => $_ } qw<a b c>}) {
    say "$i: $v";
}

[download]

In reply to perl v5.16 bug? by randian

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