anchor.diff:  mkdir -p src/js/hello.js
   ----
   
  -JavaScript files do not declare namespaces, so we compute one based on the
  -location of entry. Since the `:foreign-libs` entry specified `"src"` the
  -namespace of this JavaScript file for usage from ClojureScript will be `js.hello`.
  +JavaScript files do not declare namespaces, so the ClojureScript compiler will
  +compute one based on the location of entry. Since the `:foreign-libs` entry
  +specified `"src"` the namespace of this JavaScript file for usage from
  +ClojureScript will be `js.hello`.
   
   Edit this file to look like the following:
   
  
positive.code: [[prerequisites]]
  == Prerequisites
  
  This guide assumes you have the latest release of JDK 8 and the latest stable
  version of Node.js installed for the REPL portion of the guide. This guide only
  uses Leiningen for managing dependencies and is easily adapted to Boot or Maven.
  
  [[es6]]
  == ES6
  
negative.code: In this case the ClojureScript compiler will recursive search this directory
  for `.js` files and automatically create the `:foreign-libs` entries for you
  with the supplied options. The `:provides` namespace for each entry will
  automatically be created from the directory structure.
  
  Let's create the main ClojureScript namespace:
  
  