anchor.diff:  ```
   
   #### `--poll`
  +
  +<% impl_status dart: '1.8.0' %>
   
   This flag, which may only be passed along with `--watch`, tells Sass to manually
   check for changes to the source files every so often instead of relying on the
  
positive.code: 
  #### `--interactive`
  
  This flag (abbreviated `-i`) tells Sass to run in interactive mode, where you
  can write [SassScript expressions][] and see their results. Interactive mode
  also supports [variables][].
  
negative.code: 
  #### `--update`
  
  <% impl_status dart: '1.4.0' %>
  
  If the `--update` flag is passed, Sass will only compile stylesheets whose
  dependencies have been modified more recently than the corresponding CSS file
  was generated. It will also print status messages when updating stylesheets.
  