flash for node 0.12 and lower version

I'm using node 0.12.5. I cannot get the message in jade views with forms like 'flash.info', am I using it in a wrong way?
What's more, I must add
`
res.locals.flash = req.flash();
`
in your flash.js after
`
req.flash = _flash;
`
in line 20 and successfully get the message.
What's wrong with me please?

Start by reproducing the reported behavior with Node 0.12.5, Jade views, and flash.info usage. Inspect flash.js around line 20, including req.flash and the manually added res.locals.flash assignment. Done means determining whether this usage is supported and documenting or correcting the observed behavior.

Written by the indexing model from the issue text.