anchor.diff:  
   Once in the REPL you can type Clojure expressions and press enter to evaluate them.
   
  -There are many Clojure and Java libraries available that provide access to practically any functionality you might need. Java includes several libraries for time and date handling, but you might find some code on the Internet for the commonly used Clojure https://github.com/clj-time/clj-time[clj-time] library:
  +There are many Clojure and Java libraries available that provide access to practically any functionality you might need. These may be libraries you are writing locally, projects in git (e.g. on github) or, commonly, libraries available in the Maven ecosystem and hosted by central repositories like Maven central or Clojars. 
  +
  +For example, consider the commonly used Clojure library https://github.com/clj-time/clj-time[clj-time] for working with dates and times. If you tried to use it at the REPL, it would fail:
   
   [source,clojure]
   ----
  
positive.code: Hello world, the time is 02:04 PM
  ----
  
  And finally, the `clj` tool can also evaluate one or more expressions directly from the command line:
  
  [source,shell]
  ----
  $ clj -e "(use 'hello.world) (-main)"
  Hello world, the time is 02:05 PM
  ----
  
  == Using local libraries
  
  After a while you might decide to break a library out of this application. The `clj` tool uses local coordinates to support projects that exist only on your local disk. Let's extract the clj-time parts of this application out into a library called hello/time.
  
  In a new directory, use the deps.edn file you already have, and create a file `src/hello/time.clj`:
  
  
negative.code: }
  ----
  
  Activate both aliases as follows: `clj -R:bench:old-async`.
  
  [[local_jar]]
  === Include a local jar on disk
  