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while (<>) {
}

while (defined( my $line = <>)) {
}

perl -MO=Deparse -e 'while (<>) {}'
while (defined($_ = <ARGV>)) {
    ();
}

perl -MO=Deparse -e ' if(1) {print "true"}'     
do {
    print 'true'
};

perl -MO=Deparse -e ' print "true" if 1'   
print 'true';