>perl -wE"my $x=4; my $y=5; say $x + 6"
10

>perl -wE"my $x=4; my $y=5; say $x +6"
say() on unopened filehandle 4 at -e line 1.

>perl -wE"my $x=4; my $y=5; say $x +$y"
say() on unopened filehandle 4 at -e line 1.