picard:~ [10:30:46]$ perl -MFatal=open -e 'open F, "<", \"foo"'
picard:~ [10:31:02]$ ^<^<:raw
perl -MFatal=open -e 'open F, "<:raw", \"foo"'
Can't open(F, <:raw, SCALAR(0x814fe04)): No such file or directory at (eval 1) line 3
        main::__ANON__('F', '<:raw', 'SCALAR(0x814fe04)') called at -e line 1