yasuyk/helm-flycheck — pull request #6 by ncaq (2014-09-14 22:25:17+00:00)
Title: Emacs 24.3 have not "if-let"

if-let is non release version macro.
It is trunk.

dash.el have -if-let macro.
helm-flycheck.el require dash.el already.
I suggest to use this macro.