anchor.diff:  * Add it to the +Application.hs+ file.
   * Put a module statement at the top, and an +import Import+ line below it.
   
  -You can use the +yesod add-handler+ command to automate the last three steps.
  +You can use the +stack exec -- yesod add-handler+ command to automate the last three steps.
   
   === widgetFile
   
  
positive.code: 
  ==== Cabal file
  
  Whether directly using +cabal+, or indirectly using +yesod devel+, building
  your code will always go through the cabal file. If you open the file, you'll
  see that there are both library and executable blocks. If the +library-only+
  flag is turned on, then the executable block is not built.  This is how +yesod
  
negative.code: 
  * When developing, use +yesod devel+ exclusively.
  
  * When building a production build, perform +stack clean &amp;&amp;
    stack build+. This will produce an optimized executable in your
    +dist+ folder. (You can also use the +yesod keter+ command for
    this.)
  
  You might be surprised to see the +NoImplicitPrelude+ extension. We turn this
  on since the site includes its own module, +Import+, with a few changes to the
  