IO::File inherits from IO::Handle, so the parent methods are also available to you. (You might have better luck with the ambiguous syntax if you use a Perl-style loop. I have not tested that, however.)

Update: PSI::ESP will only be available when the already-complex Perl grammar is complete enough to DWIMHM (might have meant). :)

Anyone who can figure out how to allow post-expression for clauses while retaining the standard procedural loop and adding support for finding missing semicolons in the first case, should feel free to send me a message. We could fix a parser bug. *shiver*