anchor.diff:  ### Any values stored under the key prefix "foo" must end with "bar"
   
   ```text
  -
   key "foo" {
  -policy = "write"
  -sentinel {
  -    import "strings"
  -    main = rule { strings.has_suffix(value, \"foo\") }
  +    policy = "write"
  +    sentinel {
  +        code = "import \"strings\"
  +                main = rule { strings.has_suffix(value, \"bar\") }"
       }
   }
   ```
  
positive.code: 
  ```text
  key "foo" {
  policy = "write"
  sentinel {
      import "time"
      main = rule { time.hour > 8 and time.hour < 17 }
      }
  }
  ```
  
negative.code: ```text
    sentinel {
        code = "import \"strings\"
                main = rule { strings.has_suffix(value,\"foo\") }"
        enforcementlevel = "soft-mandatory"
    }
  ```
  