How do I prevent List::MoreUtils from warning about using $a and $b only once?

Question

The List::MoreUtils module indicates that you use the variables $a and $b when supplying the BLOCK that goes with the pairwise

Answer 1

Depends on what you consider elegant.

no warnings qw(once);
our ($a, $b);

One of these two will suffice. You can even limit their scope pretty easily.

my @sums = pairwise { no warnings qw(once); $a + $b } @x, @y;
my @sums = pairwise { our $a + our $b } @x, @y;

Explicitly specifying the package will suppress the warning too. If you're in main,

my @sums = pairwise { $::a + $::b } @x, @y;