Errors

use_warnings

PerlX::Maybe, Syntax::Feature::Maybe

valid_signature

Old SIGNATURE detected. Please inform the module author to regenerate SIGNATURE using Module::Signature version 0.82 or newer.
gpg: Signature made Tue 12 Mar 2013 10:55:31 PM JST
gpg:                using DSA key CEBF81286A2A7D39
gpg: Can't check signature: No public key