use v5.14;
use strict;
use warnings;

use constant MASK => 0xF0;
use constant VAL  => 0x0F;

sub get_val1   { VAL }
sub get_val2() { VAL }
sub get_mask   { MASK }

# Is & a function sigil or the bitwise and?
say VAL & get_mask;
say get_val1 & get_mask;
say get_val1 & MASK;
say get_val2 & MASK;
say get_val1() & MASK;