-- (nexting.pl:7)
my $x=1; my $y=2; 
different is on.
-- (nexting.pl:8)
$x=$y; $y = 4; $x += $y;
-- (nexting.pl:8)
$x=$y; $y = 4; $x += $y;
-- (nexting.pl:9)
$x=6; $y = p(); my $z = p();