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: 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 the directory structure.
  
  Let's create the main ClojureScript namespace:
  
  
negative.code: == Using the REPL
  
  Since JavaScript modules simply get compiled into Google Closure namespaces, all
  of the generic ClojureScript REPL features just work. For example, if you want
  automatic hot-loading of your ES6 source files just use Figwheel.
  
  We'll demonstrate manual hot-loading with the standard Node.js REPL.
  
  