>> perl -MO=Deparse -e 'do ("print")'
do 'print';
-e syntax OK

>> perl -MO=Deparse -e 'do (print)'
do print($_);
-e syntax OK

>> perl -MO=Deparse -e 'do print'
do 'print';
-e syntax OK

>> perl -MO=Deparse -e 'do{print}'
print $_;;
-e syntax OK