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$ perl -we 'open O, "> /dev/null"; print O (scalar readline)'
Filehandle O opened only for output at -e line 1.
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$  perl -we 'open O, "> /dev/null"; print O (scalar readline)'
Filehandle O opened only for output at -e line 1.
...

$ perl -e 'warn readline()'
Warning: something's wrong at -e line 1.