The code could use closures to split the expression or define local functions on the bottom of the surrounding function (a.k.a Haskell style). This would increa

The code could use closures to split the expression or define local functions on the bottom of the surrounding function (a.k.a Haskell style). This would increase readability a lot. Example: https://play.rust-lang.org/?gist=7ea1a39971399d0429f0369cb9ef1382&version=stable&mode=debug&edition=2015 https://play.rust-lang.org/?gist=7ea1a39971399d0429f0369cb9e...