perl 5.19.9 include signatures feature, and it will be released on 5.20 .
The feature break syntax of sub-routine prototype. For example, signatures 
allow to write like follow.

sub foo($class, $a, $b = sub(){ warn "foo" }) {
  # ...
}

Below is a patch.

https://gist.github.com/mattn/9185175

Thanks.
- Yasuhiro Matsumoto

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