> perl -le "            use POSIX; print 'x',POSIX::O_RDWR();"
x2
 > perl -le "use strict; use POSIX; print 'x',POSIX::O_RDWR();"
x2
 > perl -le "            use POSIX; print 'x',POSIX::O_RDWR;"
x2
 > perl -le "use strict; use POSIX; print 'x',POSIX::O_RDWR;"
x2